Callirhytis serricornis (Hymenoptera: Cynipidae)   (Synonym: Andricus serricornis)
Kernel Flower Gall Wasp
Anthony Chabot Regional Park, Alameda County, California
June 24, 2007

Detached from Quercus agrifolia (coast live oak). This is a gall of the summer unisexual generation of the wasp. The spring bisexual gall is shown here.