Callirhytis congregata (Hymenoptera: Cynipidae) (Synonym: Andricus congregata) Sausage Flower Gall Wasp Knowland Park, Oakland, Alameda County, California April 16, 2012 Catkin gall on coast live oak (Quercus agrifolia).
Catkin gall on coast live oak (Quercus agrifolia).