Red-pea gall
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The red-pea gall or red currant gall develops as a chemically induced distortion arising from the underside of the mid-rib of a vein on Quercus species and it is attached by a short stalk or peduncle.
Red Pea gall Cynips divisa on Oak
Gall
Videos
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
Red-pea gall
…mid-rib of a vein on Quercus species and it is attached by a short stalk or peduncle. The red-wart gall is the sexual phase of the same species. The gall is caused by the parthenogenetic generation of Cynips divisa, which has been known by the synonyms Diplolepis divisa, Dryophanta divisa and Spathegaster…
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