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..there are five silk button spangle galls on the leaf, caused by N.numismalis. These have a cupped appearance, dark in middle, lighter outside.
Thanks Dave, yes, this picture blows up quite well and is probably my best picture of both of these galls. I might post it as an obs of the Silk Button galls as well. Cheers, Paul
Lat/Lng: 50.9171, -0.1491
OS grid ref: TQ302147