Silk button galls, Neuroterus numismalis, in abundance on the underside of Common Oak leaves. Autumn.

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Photo credit: © Bob Gibbons / Alamy / Afripics
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Keywords: autumn, autumnal, blister, button, color, colorful, colors, colour, colourful, colours, common, english, fall, foliage, gall, gall-forming, gall-wasp, gall-wasps, galls, leaf, leaves, neuroterus, november, numismalis, oak, october, pedunculate, quercus, robur, silk, wasp