An x-ray of an Oak Gall
An x-ray of a common gall effecting oak trees, Quercus sp. This gall is sometimes called Oak-apples. A gall is an abnormal growth or swelling formed by a plant as a result of attack by parasites such as bacteria, fungi, nematodes, insects and mites. These galls are caused by larvae of parasitic wasps. Oak- apples are valued for the high-content of tannin within them.
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