Unknown gall.
Quercus chrysolepis
Leaf galls, separable from leaf intact
Small sphere, hilum on top, brown, surface slightly striate. Spring. Fig 137.
Fig 137. Q. chrysolepis. On upper or lower surface, brown, the surface slightly striate or wrinkled.
”- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=86