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Callirhytis congregata
2222_2073 Photo added 2010-03-28

Callirhytis congregata (Hymenoptera: Cynipidae)   (Synonym: Andricus congregata)
Sausage Flower Gall Wasp
Knowland Park, Oakland, Alameda County, California
March 25, 2010

Catkin gall on Quercus agrifolia (coast live oak).

all photos and text © Joyce Gross