Quercus chrysolepis
Leaf galls, separable from leaf intact
Mushroom-shaped, with hairy rim, dia 7 mm by 3 mm high, upper side. Fig 167.
Fig. 167. Unknown. Mushroom-shaped, on under side of leaf of Q. chrysolepis. Diameter 7.0 mm. Exit hole on upper side of leaf. Half-grown on June 15 on new leaves (Camp Baldy).
”- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=88