Andricus lignicola
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Cola-nut galls develop as a chemically induced distortion of leaf axillary or terminal buds on pedunculate oak or sessile oak trees, caused by the agamic gall wasp Andricus lignicola which lays single
Andricus lignicola Cola nut Gall
Cola-nut gall cut open to show the unilocular cavity
Oak marble galls showing two stunted and two normal-sized examples
Cola-nut gall showing exit hole
Andricus kollari
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Andricus kollari, also known as the marble gall wasp, is a species of wasp which causes the formation of marble galls on oak trees. Synonyms for the species include Cynips kollari, Andricus quercusgem
Andricus lignicola
…species A. lignicola is A. lignicolus and A. venheurni. The galls are found in small groups, which however do not coalesce, distinguishing them from the oak marble gall (Andricus kollari); in addition the shape is ovoid rather than spherical and the surface is scaly rather than smooth. It grows up to about 10 x 8 mm…
Hymenoptera Cynipidae Andricus kollari 201408230042
A developing oak marble gall
An oak apple gall; often confused with the oak marble gall: the brown areas are scale remnants from the bud.