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gall on common cat's-ear: Phanacis hypochoeridis
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Wanstead Flats, 31 May 2017 |
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Reputably rare, according to British Plant Galls, this is caused by a Hymenopteran wasp in the family Cynipidae. This one was found on the slopes of the bank leading down from the area near Centre Road to what were the brickfields. |