Quercus chrysolepis
Leaf galls, separable from leaf intact
Pill-box-shaped, rugose spangle with light smooth center, on under side. 177.
Fig 177. Unknown. On under side of leaf of Q. chrysolepis. Cream-colored, always in a row. From Fawnskin, Calif. only, in August (N.W.C.).
”- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=88