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Photo#447037
leaf gall on blue oak - Andricus gigas

leaf gall on blue oak - Andricus gigas
near Groveland, Stanislaus National Forest, Toulumne County, California, USA
August 18, 2010
Size: ~3 mm diameter
Small cup-like gall on upper surface of Blue Oak (Quercus douglasii) in shrubby vegetation in western foothills of Sierra Nevada mountains. (I am not familiar with California oaks, so would welcome correction of my tentative ID.)

Images of this individual: tag all
leaf gall on blue oak - Andricus gigas leaf gall on blue oak - Andricus gigas leaf gall on blue oak - Andricus gigas

Moved
Moved from Gall Wasps.

Andricus gigas
These galls have toothed edges at the top, so are Andricus gigas. A. gigas seems to have a range of shapes from mostly flat to quite cupped. Sometimes when I've collected flatter ones they curl up after being off the tree for a while. Sometimes they are very cupped or rounded when they're still on the tree. Ron Russo considers a version more rounded than this one to possibly be an undescribed species. I don't know if that's the case, but this gall is still within the range of a normal gigas.

Some A. gigas galls are not crenated, or at least barely so. Phylloteras cupella galls are generally taller than wide, the apex is not toothed, the shape is somewhat barrel-like, and the larval chamber a little less pronounced (if you can manage to see it at all).

Maybe Phylloteras cupella?
http://joycegross.com/images.php?search=2&taxon=Phylloteras+cupella&ordr=

Moved
Moved from Unidentified Galls.

Moved
Moved from ID Request.

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