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Photo#832481
Andricus crystallinus ? - Feron crystallinum

Andricus crystallinus ? - Feron crystallinum
1.5 mi. NNW. of Antelope Fire Control Station, Willow Springs, San Benito County, California, USA
August 27, 2013
Size: 3cm wide mass
These galls cover the entire underside of the leaf of Quercus douglasii. 36.66563°N, 121.03490°W, 2643 ft. elevation. I think they are formed by Andricus crystallinus, based mainly on (1).

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