Callirhytis quercuscornigera

Horned Oak Galls are Living Up to Their Common Name

The “horns” that give the Horned Oak Gall its common name are bursting to the surface in southwest Ohio. The horns make the galls look like a miniature version of a medieval martial arts weapon. The woody stem galls were formed under the direction of the gall-wasp, Callirhytis quercuscornigera (syn. Callirhytis cornigera (Family Cynipidae)).
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Joe Boggs