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Photo#362942
Two-horned Gall Wasp gall - Dryocosmus dubiosus

Two-horned Gall Wasp gall - Dryocosmus dubiosus
Las Trampas Regional Park, Contra Costa County, California, USA
September 13, 2009
Size: ~3mm
On Quercus kelloggii (black oak). I rarely see leaf galls on Q. kelloggii but this cynipid does gall black oak leaves.