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  • Transverse section of a King Solomon's-seal (Polygonatum muliiflorum) stem. Polygonatum (King Solomon's-seal, Solomon's Seal) is a genus of about 50 species of flowering plants within the family Ruscaceae, formerly classified in the lily family Liliaceae.  Light micrograph of a section through a  stem.  The magnification is 200 times when printed 10 inches wide.
    K07KingSolomon200x05.tif
  • Scanning electron microscope image of a staghorn fern leaf (Platycerium holtummii)  magnified 76x.  Staghorn ferns are epiphytic perennials or "air" plants. Staghorns are native to jungles in Africa and Asia .
    K08-semFERN1.jpg
  • Transverse section of a King Solomon's-seal (Polygonatum muliiflorum) stem. Polygonatum (King Solomon's-seal, Solomon's Seal) is a genus of about 50 species of flowering plants within the family Ruscaceae, formerly classified in the lily family Liliaceae.  Light micrograph of a section through a  stem.  The magnification is 32 times when printed 10 inches wide.
    K07KingSolomon32x.tif
  • A false color SEM image of a Calcium oxalate crystal.  Even a small dose of calcium oxalate is enough to cause intense sensations of burning in the mouth and throat.  Commonly found in popular houseplants, such as Dumbcane, the crystals effects or symptoms may last for a week or more, making calcium oxalate crystals a non-desirable ingredient in medicinal cannabis.  It is surprising that calcium oxalate is rarely discussed in literature about medical marijuana (cannabis).  There crystals are fairly common in plants, as they make it hard for grazing animals to eat the plant. Image is 20 um wide.
    K13SEM-pot-oxalate01A.jpg
  • A false color SEM image of a Calcium oxalate crystal.  Even a small dose of calcium oxalate is enough to cause intense sensations of burning in the mouth and throat.  Commonly found in popular houseplants, such as Dumbcane, the crystals effects or symptoms may last for a week or more, making calcium oxalate crystals a non-desirable ingredient in medicinal cannabis.  It is surprising that calcium oxalate is rarely discussed in literature about medical marijuana (cannabis).  There crystals are fairly common in plants, as they make it hard for grazing animals to eat the plant. Image is 70 um wide.
    K13SEM-pot-oxalate02.jpg
  • A scanning electron microscope image of the stem of a cannabis (Cannabis sativa) plant. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170607stemA005pan.jpg
  • False color Scanning Electron Micrograph (SEM) of the new growth at the tip of the bud of a marijuana plant (Cannabis sativa). The plant produces tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The filed of view in this image is 4 mm wide.
    k170509cryotest-zhp-alcuK066pan.jpg
  • X-Ray of the  Chinese lantern plant, (Physalis alkekengi) also called the winter cherry or bladder cherry is a member of the potato family.  The chinese lantern plant is used mostly for decorative purposes, but is also harvested for its fruit. The fruit has twice the Vitamin C of lemons and resembles a blonde-red cherry tomato.
    K11Xlatern2C.jpg
  • Close up of the leaf of a cannabis plant. The trichomes on the bud of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes. These stalked trichomes have glands at the sop that store THC. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  The width of the ball like structure is 90 um, or about the width of a human hair.
    K18optical-canna-bud20171011A.jpg
  • Close up of the leaf of a cannabis plant. The trichomes on the bud of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes. These stalked trichomes have glands at the sop that store THC. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  The width of the ball like structure is 90 um, or about the width of a human hair.
    K18optical-trichomeCanna2017-10-10A.jpg
  • A scanning electron microscope image of the stem of a cannabis (Cannabis sativa) plant. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170607stemC010pan.jpg
  • A scanning electron microscope image of the stem of a cannabis (Cannabis sativa) plant. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170607stemA005panB.jpg
  • X-Ray of the  Chinese lantern plant, (Physalis alkekengi) also called the winter cherry or bladder cherry is a member of the potato family.  The chinese lantern plant is used mostly for decorative purposes, but is also harvested for its fruit. The fruit has twice the Vitamin C of lemons and resembles a blonde-red cherry tomato.
    K11Xlatern2B.jpg
  • A scanning electron microscope image of the stem of a cannabis (Cannabis sativa) plant. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170607stemC010panB.jpg
  • A scanning electron microscope image of the stem of a young 5-day-old cannabis (Cannabis sativa) plant stem. This image is a transverse section of the stem showing the different cell types. Cannabis is also known as help, and is a source of strong fibers for clothing, paper, and rope. This fast growing plant shows promise for being a cheep source of fibers in the future. This image shows a horizontal field of view of .2mm.
    K170512stemC027A.jpg
  • A scanning electron microscope image of the stem of a young 5-day-old cannabis (Cannabis sativa) plant stem. This image is a transverse section of the stem showing the different cell types. Cannabis is also known as help, and is a source of strong fibers for clothing, paper, and rope. This fast growing plant shows promise for being a cheep source of fibers in the future. This image shows a horizontal field of view of .3mm.
    K170510stemApan1.jpg
  • A scanning electron microscope image of the stem of a young 5-day-old cannabis (Cannabis sativa) plant stem. This image is a transverse section of the stem showing the different cell types. Cannabis is also known as help, and is a source of strong fibers for clothing, paper, and rope. This fast growing plant shows promise for being a cheep source of fibers in the future. This image shows a horizontal field of view of .3mm.
    K170510stemApan1B.jpg
  • A scanning electron microscope image of the stem of a young 5-day-old cannabis (Cannabis sativa) plant stem. This image is a transverse section of the stem showing the different cell types. Cannabis is also known as help, and is a source of strong fibers for clothing, paper, and rope. This fast growing plant shows promise for being a cheep source of fibers in the future. This image shows a horizontal field of view of .2mm.
    K170512stemC027B.jpg
  • A scanning electron microscope image of the stem of a young 5-day-old cannabis (Cannabis sativa) plant stem. This image is a transverse section of the stem showing the different cell types. Cannabis is also known as help, and is a source of strong fibers for clothing, paper, and rope. This fast growing plant shows promise for being a cheep source of fibers in the future. This image shows a horizontal field of view of .3mm.
    K170510stemApan1C.jpg
  • A false color x-ray of teh cattail plant ((Typha latifolia).
    K15Xcattail01B.jpg
  • A false color x-ray of teh cattail plant ((Typha latifolia).
    K15Xcattail01FX.jpg
  • A false color x-ray of teh cattail plant ((Typha latifolia).
    K15Xcattail01A.jpg
  • Crystals in the roots of the Cannabis plant. The exact composition of these are currently unknown and their role in the life cycle of the plant is a mystery. Why are they there? What do they do? What is the chemical composition of the crystals? Just a few of the questions that seem to be a daily occurrence when looking at the cannabis plant with this level of magnification.<br />
Magnification on the printed page is 4300x at 9 inches wide.
    170614Root-crystalscombo.jpg
  • Crystals in the roots of the Cannabis plant. The exact composition of these are currently unknown and their role in the life cycle of the plant is a mystery. Why are they there? What do they do? What is the chemical composition of the crystals? Just a few of the questions that seem to be a daily occurrence when looking at the cannabis plant with this level of magnification.<br />
Magnification on the printed page is 4300x at 9 inches wide.
    K170614Root-crystalscombo.jpg
  • A seedling of the coca plant (Erythroxylon coca). The leaves contain the stimulant chemical cocaine. They can be chewed to produce a mild stimulant effect, or made into an infusion. The plant is native to the slopes of the Andes in South America, where indigenous people have used it for centuries. The leaves can also be processed to extract pure cocaine. For this reason the cultivation of the plant is controversial.
    K17cocaineplant-5.jpg
  • Transverse section of a Black Bryony stem.  Light micrograph of a section through the stem.  Black Bryony (Tamus communis) is a flowering plant, in the yam family Dioscoreaceae, native to Europe, northwest Africa and Asia.  This plant is poisonous.  It is a climbing herbaceous plant growing to 2-4 m tall, with twining stems. The magnification is 32 times when printed 10 inches wide.
    K07Tamus-communis32x.tif
  • A seedling of the coca plant (Erythroxylon coca). The leaves contain the stimulant chemical cocaine. They can be chewed to produce a mild stimulant effect, or made into an infusion. The plant is native to the slopes of the Andes in South America, where indigenous people have used it for centuries. The leaves can also be processed to extract pure cocaine. For this reason the cultivation of the plant is controversial.
    K17cocaineplant-7.jpg
  • A seedling of the coca plant (Erythroxylon coca). The leaves contain the stimulant chemical cocaine. They can be chewed to produce a mild stimulant effect, or made into an infusion. The plant is native to the slopes of the Andes in South America, where indigenous people have used it for centuries. The leaves can also be processed to extract pure cocaine. For this reason the cultivation of the plant is controversial.
    K17cocaineplant-2.jpg
  • X-ray of Pacific Mistletoe (Phoradendron villosum) collected in California, USA Mistletoe is a partial parasite. It bears evergreen leaves that carry out some photosynthesis of their own, while it relies on the host plant mainly for mineral nutrients from the ground.
    K14X-mistlletoe-1C.jpg
  • A seedling of the coca plant (Erythroxylon coca). The leaves contain the stimulant chemical cocaine. They can be chewed to produce a mild stimulant effect, or made into an infusion. The plant is native to the slopes of the Andes in South America, where indigenous people have used it for centuries. The leaves can also be processed to extract pure cocaine. For this reason the cultivation of the plant is controversial.
    K17cocaineplant-6.jpg
  • Sweet Flag Stem (Acorus calamus)  Light micrograph of a section through a fig tree stem. The large holes are cross-sections of xylem, vascular tissue used to transport water and minerals from the roots.  The rootstock of this aromatic plant are used as a natural insecticide and an ingredient of perfumes. The roots  were used for various medicinal purposes, and reportedly induce hallucinations if eaten in sufficiently large quantities. In modern times the active chemical in the plant have been identified as Beta-asarone,  a carcinogen.  The Food & Drug Administration (FDA) has banned the use of the sweet flag as a food additive. The magnification is 200 times when printed 10 inches wide.
    K07sweet-flag200x-11.tif
  • Sweet Flag Stem (Acorus calamus)  Light micrograph of a section through a fig tree stem. The large holes are cross-sections of xylem, vascular tissue used to transport water and minerals from the roots.  The rootstock of this aromatic plant are used as a natural insecticide and an ingredient of perfumes. The roots  were used for various medicinal purposes, and reportedly induce hallucinations if eaten in sufficiently large quantities. In modern times the active chemical in the plant have been identified as Beta-asarone,  a carcinogen.  The Food & Drug Administration (FDA) has banned the use of the sweet flag as a food additive. The magnification is 200 times when printed 10 inches wide.
    K07sweet-flag200x-1.tif
  • Sweet Flag Stem (Acorus calamus)  Light micrograph of a section through a fig tree stem. The large holes are cross-sections of xylem, vascular tissue used to transport water and minerals from the roots.  The rootstock of this aromatic plant are used as a natural insecticide and an ingredient of perfumes. The roots  were used for various medicinal purposes, and reportedly induce hallucinations if eaten in sufficiently large quantities. In modern times the active chemical in the plant have been identified as Beta-asarone,  a carcinogen.  The Food & Drug Administration (FDA) has banned the use of the sweet flag as a food additive. The magnification is 25 times when printed 10 inches wide.
    K07sweet-flag.tif
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant bud.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-A01color-CSC.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-k070panA1C.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-k070panA1A.jpg
  • A scanning electron microscope image of the stem of a young cannabis (Cannabis sativa) plant. The thorn-like trichomes use a physical defense to keep insects and animals from eating the plant. The stem is 1.5 mm diameter in this image.
    K170429-5day064C.jpg
  • X-ray of Pacific Mistletoe (Phoradendron villosum) collected in California, USA Mistletoe is a partial parasite. It bears evergreen leaves that carry out some photosynthesis of their own, while it relies on the host plant mainly for mineral nutrients from the ground.
    K14X-mistlletoe-1.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the bottom surface of a cannabis (Cannabis sativa) plant.  Magnification is 90x when printed 10 cm wide.
    K14SEM-canna-29B.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the bottom surface of a cannabis (Cannabis sativa) plant.  Magnification is 90x when printed 10 cm wide.
    K14SEM-canna-29.jpg
  • Sweet Flag Stem (Acorus calamus)  Light micrograph of a section through a fig tree stem. The large holes are cross-sections of xylem, vascular tissue used to transport water and minerals from the roots.  The rootstock of this aromatic plant are used as a natural insecticide and an ingredient of perfumes. The roots  were used for various medicinal purposes, and reportedly induce hallucinations if eaten in sufficiently large quantities. In modern times the active chemical in the plant have been identified as Beta-asarone,  a carcinogen.  The Food & Drug Administration (FDA) has banned the use of the sweet flag as a food additive. The magnification is 200 times when printed 10 inches wide.
    K07sweet-flag200x-10.tif
  • Sweet Flag Stem (Acorus calamus)  Light micrograph of a section through a fig tree stem. The large holes are cross-sections of xylem, vascular tissue used to transport water and minerals from the roots.  The rootstock of this aromatic plant are used as a natural insecticide and an ingredient of perfumes. The roots  were used for various medicinal purposes, and reportedly induce hallucinations if eaten in sufficiently large quantities. In modern times the active chemical in the plant have been identified as Beta-asarone,  a carcinogen.  The Food & Drug Administration (FDA) has banned the use of the sweet flag as a food additive. The magnification is 200 times when printed 10 inches wide.
    K07sweet-flag200x-4.tif
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-multiBSE-001.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image. The filed of view of this image is 3 mm wide.
    K170609bractF028panA.jpg
  • The pollen from a male cannabis plant is nestled into the female stigma and is in the process of transferring genetic material to the female to create a seed.  The pollen is 20 um in diameter. A single grain of pollen is too small to see with the human eye. The pollen is scattered by air current to pollenate the female plant.
    K170525-D027panA.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-H062panC.jpg
  • A scanning electron microscope image of the stem of a young cannabis (Cannabis sativa) plant. The thorn-like trichomes use a physical defense to keep insects and animals from eating the plant. The stem is 1.5 mm diameter in this image.
    K170429-5day064B.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 100x when printed 10 cm wide.
    K14SEM-canna-44.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Magnification is 180x when printed 10 cm wide.
    K14SEM-canna-19.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-multiBSE-001canna-14.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-canna-37.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant bud.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-A04C.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant bud.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-A01color-CSB.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170524CPD-B-M094panC.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170524CPD-B-M094panA.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-C035A.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517-A021panC.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517-A021panB.jpg
  • X-ray of Pacific Mistletoe (Phoradendron villosum) collected in California, USA Mistletoe is a partial parasite. It bears evergreen leaves that carry out some photosynthesis of their own, while it relies on the host plant mainly for mineral nutrients from the ground.
    K14X-mistlletoe-1B.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of a trichome on the top of a leaf of a cannabis (Cannabis sativa) plant.  Magnification is x700 when printed 10 cm wide.
    K14SEM-cannabis53.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the bottom surface of a cannabis (Cannabis sativa) plant.  Magnification is 70x when printed 10 cm wide.
    K14SEM-canna-25.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the bottom surface of a cannabis (Cannabis sativa) plant.  Magnification is 70x when printed 10 cm wide.
    K14SEM-canna-25B.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the top surface of a cannabis (Cannabis sativa) plant.  Magnification is 180x when printed 10 cm wide.
    K14SEM-canna-13.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 120x when printed 10 cm wide.
    K13SEM-canna-45.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 52x when printed 10 cm wide.
    K13SEM-canna-43.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 100x when printed 10 cm wide.
    K13SEM-canna-42.jpg
  • Transverse section of Stinking Hellebore (Helleborus foetidus).  A poisonous plant.  Light micrograph of a section through a stem.  The magnification is 200 times when printed 10 inches wide.
    K07Stinking200x03.tif
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant bud.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-A04A.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant bud.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-A01color-CSA.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image. The filed of view of this image is 3 mm wide.
    K170609bractF028panB.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. The filed of view in this image is 4 mm wide. This flower has been pollinated and is startign to develop a seed.
    K170609BractP066panB.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. The filed of view in this image is 4 mm wide. This flower has been pollinated and is startign to develop a seed.
    K170609BractP066panA.jpg
  • The pollen from a male cannabis plant is nestled into the female stigma and is in the process of transferring genetic material to the female to create a seed.  The pollen is 20 um in diameter. A single grain of pollen is too small to see with the human eye. The pollen is scattered by air current to pollenate the female plant.
    K170525-F048panA.jpg
  • The pollen from a male cannabis plant is nestled into the female stigma and is in the process of transferring genetic material to the female to create a seed.  The pollen is 20 um in diameter. A single grain of pollen is too small to see with the human eye. The pollen is scattered by air current to pollenate the female plant.
    K170525-E038panA.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-k070panA1B.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-H062panA.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-C035B.jpg
  • A scanning electron microscope image of the stem of a young cannabis (Cannabis sativa) plant. The thorn-like trichomes use a physical defense to keep insects and animals from eating the plant. The stem is 1.5 mm diameter in this image.
    K170429-5day064.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 90x when printed 10 cm wide.
    K14SEM-canna-46B.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 90x when printed 10 cm wide.
    K14SEM-canna-46.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Magnification is 180x when printed 10 cm wide.
    K14SEM-canna-19B.jpg
  • Transverse section of Stinking Hellebore (Helleborus foetidus).  A poisonous plant.  Light micrograph of a section through a stem.  The magnification is 200 times when printed 10 inches wide.
    K07Stinking200x02.tif
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170524CPD-B-M094panB.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517-A021panA.jpg
  • Transverse section of Stinking Hellebore (Helleborus foetidus).  A poisonous plant.  Light micrograph of a section through a stem.  The magnification is 32 times when printed 10 inches wide.
    K07Stinking32x.tif
  • Transverse section of a Acacia dealbata (Silver Wattle) stem. Silver Wattle is a species of Acacia, native to southeastern Australia.  It is a fast growing evergreen tree or shrub growing up to 30 m tall, typically a pioneer species after fire.  Acacia dealbata is widely cultivated as an ornamental plant.  Light micrograph of a section through a stem.  The magnification is 200 times when printed 10 inches wide.
    K07SilverWattle200x06.tif
  • Butchers Broom (box holly) Ruscus aculeatus. Butcher's broom is an aromatic, diuretic, mildly laxative herb that reduces inflammation and constricts the veins.  The plant is considered a medicinal herb since medieval times.  Magnifation is 32 times when printed 10 inches wide.
    K07butchers-broom.tif
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant bud.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-A04B.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-H062panB.jpg
  • Colored-enhanced scanning electron micrograph (SEM) of a section through a xylem vessel in a cannabis stem. The xylem transports water and mineral nutrients from the roots throughout the plant. The walls of the xylem vessels are strengthened with lignin  loops, a woody substance that helps to support the plant. Magnification: x2200 when printed at 10 centimeters wide.
    K13SEM-canna67.jpg
  • Transverse section of Stinking Hellebore (Helleborus foetidus).  A poisonous plant.  Light micrograph of a section through a stem.  The magnification is 200 times when printed 10 inches wide.
    K07Stinking200x04.tif
  • Transverse section of Hogweed Stem (Heracleum mantegazzianum).  Light micrograph of a section through a stem. Hogweed is a very invasive plant.  The magnification is 200 times when printed 10 inches wide.
    K07hogweed200x01.tif
  • Butchers Broom (box holly) Ruscus aculeatus. Butcher's broom is an aromatic, diuretic, mildly laxative herb that reduces inflammation and constricts the veins.  The plant is considered a medicinal herb since medieval times.  Magnifation is 200 times when printed 10 inches wide.
    K07butchers-broom200x1.tif
  • Colored-enhanced scanning electron micrograph (SEM) of a section through a xylem vessel in a cannabis stem. The xylem transports water and mineral nutrients from the roots throughout the plant. The walls of the xylem vessels are strengthened with lignin  loops, a woody substance that helps to support the plant. Magnification: x1200 when printed at 10 centimeters wide.
    K13SEM-canna66.jpg
  • Butchers Broom (box holly) Ruscus aculeatus. Butcher's broom is an aromatic, diuretic, mildly laxative herb that reduces inflammation and constricts the veins.  The plant is considered a medicinal herb since medieval times.  The magnification is 200 times when printed 10 inches wide.
    K07butchers-broom200x2.tif
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-cannnabis65.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 400x when printed 10 cm wide.
    K13SEM-canna38.jpg
  • A Black walnut fruit (Juglans nigra). The specimen was illuminated with shortwave ultraviolet light (UV) that cannot be detected with the camera used for this image. The tissues in the plant absorbed the UV light and fluoresced in the visible spectrum. This technique is called ultraviolet light induced visible light fluorescence (UVIVLF) and is often used in biology to detect unique compounds in samples. This image is part of a series
    K20-UVIVF_4392.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    K170614leafC016pan03.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The head o fthe trichome is 60 um in diameter.
    K170607stemE038A-pan.jpg
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