Acari: Eriophyoidea - gall mite Eriophyes leionotus Photographs on Betula, Birch Hosts: Betula pubescens, Betula pubescens x pendula Shiny, +/- smooth bulge in vein axils on the upperside of leaves. The gall hairs on underside of leaves have obtuse tips. Similar: Aceria lissonota / Eriophyes lissonotus. Hairy upperside bulges

Eriophyes leionotus
Broadstone, Dorset. September 2017