Today I found two galls, the cola nut gall (Andricus lignicola) and the ram's horn gall (Andricus aries) on the same oak twig on the Pestalozzi Estate here in Sedlescombe. The ram's horn gall (fairly obviously) is the upper one.
The ram's horn was first recorded in Britain from Parliament Hill, London in 1998 and has since been seen in Kent, Surrey, Essex and Berkshire, so it appears to be spreading rapidly. It was first found in Sussex (so far as I know) in 2001. Elsewhere it occurs in mainland Europe, but does not seem all that common.
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