Gall
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Galls or cecidia are a kind of swelling growth on the external tissues of plants. Plant galls are abnormal outgrowths of plant tissues, similar to benign tumors or warts in animals. They can be caused
Cola-nut galls (Andricus lignicola) on pedunculate oak, caused by a cynipid gall wasp
Oak artichoke gall caused by Andricus foecundatrix
Artichoke gall cut open to reveal wasp larva
Knopper gall caused by Andricus quercuscalicis
Andricus quercuscalicis
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Andricus quercuscalicis is a gall wasp species inducing knopper galls.
A larva of Andricus quercuscalicis in a gall formed in Quercus robur