Trichoteras vacciniifoliae (Hymenoptera: Cynipidae)   (Synonym: Andricus vaccinifoliae)
Oak Apple Wasp
Stanislaus National Forest, Calaveras County, California
June 16, 2009

Galls on Quercus vacciniifolia (Huckleberry Oak). One gall is cut open showing the central larval chamber and its radiating fibers.