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Photo#206411
Oak Gall - Amphibolips quercuspomiformis

Oak Gall - Amphibolips quercuspomiformis
Arastradero Preserve, Santa Clara County, California, USA
July 26, 2008
Size: ~ 2 cm
I found this gall on an oak tree that I thought at first was Q. agrifolia, but may have been Q. chrysolepis in hindsight... Possibly the gall of Trichoteras vaccinifoliae?

Images of this individual: tag all
Oak Gall - Amphibolips quercuspomiformis Oak Gall - Amphibolips quercuspomiformis

Moved
Moved from galls.

Callirhytis quercuspomiformis
Wasps know the oak species best... this is a summer generation Callirhytis quercuspomiformis gall. The oak should be either Q. agrifolia or Q. wislizenii. If you have a good photo of the undersides of some of the leaves it should be easy to confirm. The bit of leaf that's visible looks like agrifolia/wislizenii but it's hard to be sure. I'm very sure just because of the gall.

Callirhytis quercuspomiformis are very hard, solid galls, whereas Trichoteras vaccinifoliae are mostly hollow inside. If you squeeze the gall gently you should be able to tell which one it is (or if you cut it open). The pointy projections are typical of Callirhytis quercuspomiformis.

I'm still in NY, but this is a gall I know from afar.

 
Thanks, Joyce!
Sorry - no more photos of the leaves... I guess maybe it was agrifolia after all! I did not try to squeeze the gall - I'll try that next time.

Will move to guide page unless there are objections?

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