Oak apple
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An oak apple or oak gall is a large, round, vaguely apple-like gall commonly found on many species of oak. Oak apples range in size from 2 to 4 centimetres in diameter and are caused by chemicals inje
Oak apples on Quercus robur leaf
Oak galls on a Pyrenean oak (Quercus pyrenaica) in León, Spain.
An oak apple on a tree in Worcestershire, England
An oak apple on an oak leaf.
Andricus foecundatrix
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Andricus foecundatrix is a parthenogenetic gall wasp which lays a single egg within a leaf bud, using its ovipositor, to produce a gall known as an oak artichoke gall, oak hop gall, larch-cone gall or
Andricus foecundatrix on Quercus robur. vrouwelijke gal op zomereik
Andricus foecundatrix larva on Quercus robur. vrouwelijke gal met larve op zomereik
Detail of oak artichoke gall
Oak artichoke gall on an axillary bud