Quercus chrysolepis
Acorn galls
Cells in cup of mature acorn with separate exit holes. Fig 187.
Fig. 187. Unknown. Cells in the cup of large acorns of Q. chrysolepis. No sign of their presence until exit holes are seen in March, April, August and September. Seen at Idyllwild, Mt. Wilson, Kyburz, Santa Lucia Mts.
”- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=89