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Warts/discs/"blobs" on the underside of oak leaves
Observed: 10th November 2012 By: Flowerpot
Added: 15th February 2013
I've seen light-coloured, convex discs on the underside of fallen oak leaves for years, but never found out what they are. Can anyone enlighten me? The differently coloured/textured ones shown in the first two pictures were something that I hadn't seen before, so they particularly piqued my curiosity.