Oak Galls: Cynipidae gall flies

Oak Galls produced by the gallfly of the family Cynipidae.  Can be found all over UK... young Oaks appear to be more susceptible than older.  The acorn has been infected by a larvae which alters the normal growth of the acorn.  The flesh of the gall is less tough than an acorn would be and is larger and more rounded.


[Photos by Oliver (cc)]