2022
TQ8933 : Knopper galls on acorns
taken 2 years ago, near to Leigh Green, Kent, England
This is 1 of 5 images, with title starting with Knopper in this square
Knopper galls on acorns
Cecidology - the study of Galls
Cecidology is the name for the study of the world of galls.
A gall or a cecidium (plural: cecidia) is an abnormal growth in a plant caused by specific gall-causing insects, mites, or fungi.
Examples include the Oak Apple, that looks like a small round fruit but is actually a plant deformity caused by a wasp.
for info see: The British Plant Gall Society: Link