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Andricus kollari, also known as the marble gall wasp, is a parthenogenetic species of wasp which causes the formation of marble galls on oak trees. Synonyms for the species include Cynips kollari , Andricus quercusgemmae , A. minor , A. indigenus and A. circulans .
The oak marble is frequently called the oak apple due to the superficial resemblance and the preponderance of the oak marble gall in the wild. Other galls found on oak trees include the oak artichoke gall and the acorn cup gall , but each of these has its own distinctive form.
Cola-nut gall cut open to show the unilocular cavity Oak marble galls showing two stunted and two normal-sized examples. The galls are found in small groups, which however do not coalesce, helping to prevent mis-identification with the oak marble gall (Andricus kollari), in addition the shape is ovoid rather than spherical and it is scaly rather than smooth.
Cola-nut galls (Andricus lignicola) on pedunculate oak, caused by a cynipid gall wasp. Galls (from the Latin galla, 'oak-apple') or cecidia (from the Greek kēkidion, anything gushing out) are a kind of swelling growth on the external tissues of plants.
Galls (upper left and right) formed on acorns on the branch of a pedunculate (or English) oak tree by the parthenogenetic generation Andricus quercuscalicis.. The large 2 cm gall growth appears as a mass of green to yellowish-green, ridged, and at first sticky plant tissue on the bud of the oak, that breaks out as the gall between the cup and the acorn.
Andricus foecundatrix oak artichoke gall; Andricus kollari marble gall wasp; Andricus foecundatrix oak artichoke gall; Andricus gigas Saucer Gall Wasp; Andricus kingi Red Cone Gall Wasp; Andricus kollari marble gall wasp; Andricus lignicola oaks; Andricus parmula Disc Gall Wasp; Andricus quercuscalicis knopper gall; Andricus quercuscalifornicus ...
Andricus hispanicus is a parthenogenetic species of wasp which causes the formation of marble galls on oak trees. The galls caused by the agamous generation are similar to the closely related Andricus kollari. [1]
Examples are oak artichoke gall, oak marble gall, oak apple gall, knopper gall, and spangle gall. These galls are the handiwork of tiny wasps from the Cynipidae . In a complex ecological relationship, these gall wasps become hosts to parasitoid wasps —primarily from the order Chalcidoidea —which lay their larvae inside the gall wasps ...