Hymenoptera: Cynipidae
Club Vein Gall Wasp
Off Hwy 4 west of Sky High and Bear Valley, Calaveras County, California
November 24, 2007

The wasp that makes this gall has not yet been scientifically described. It is listed in Weld's Cynipid Galls of the Pacific Slope (1957, fig. 99) and in Ron Russo's Field Guide to Plant Galls of California and Other Western States (2007). On Quercus vacciniifolia (huckleberry oak).