Oak apple
Gall found on oak trees
Oak apple
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 (1 to 2 in) in diameter and are caused by chemicals injected by the larva of certain kinds of gall wasp in the family Cynipidae.
Read on Wikipedia · Image Ivar Leidus, CC BY-SA 4.0
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