Quercus chrysolepis
Leaf galls, separable from leaf intact
Deeper [than this gall], cup-shaped, red, dia 2.4-3.5 mm, margin crenate. Fig 178 [sic]
Fig 175. Unknown • On upper side of leaf of Q. chrysolepis. Red, margin slightly crenate, 5.5 mm. in diameter by 2.5 mm. high. Seen at Idyllwild, Calif.
”- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=88