Quercus chrysolepis
Leaf galls, separable from leaf intact
Similar [to this gall], slightly spiny, near leaf margin on under side. Fig 166.
Fig 166 Unknown gall. Ellipsoid, slightly spiny, l.5 mm. in diameter. On under side of leaf of Q. chrysolepis near the edge. Only specimen from Yosemite.
”- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=88