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Red-pea gall : ウィキペディア英語版 | Red-pea gall
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. The red-wart gall is the sexual phase of the same species. == Cause == The gall is caused by the parthenogenetic generation of ''Cynips divisa'', which has been known by the synonyms ''Diplolepis divisa'', ''Dryophanta divisa'' and ''Spathegaster verrucosus''.〔
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