[these may or may not refer to the same gall]
Quercus chrysolepis
Stem galls, detachable
Ellipsoid, blunt at apex, in axil, wall thin. June. Fig 75.
Fig. 75. Unknown bud gall. Q. chrysolepis. Empty in November (Camp Baldy).
Quercus chrysolepis
Stem galls, detachable
Conical, thin-walled, in axil or on other galls, tan, pointed at end. Fig 171.
Fig. 171. Unknown bud gall on Q. chrysolepis, thin-walled, tan, probably in early spring. Occurs in axil or sometimes attached to other galls. Length 2.5 mm. Those taken in September and November have been empty.
”- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=82