Quercus garryana
Acorn galls
"Pip" gall beside mature acorn, drops in August. Fig 149.
Fig 149. Unknown "pip" gall beside acorn in August. Q-garryana. Drop in August. Seen at Victoria, B.C., Friday Harbor, Wash., Odell, Oregon, Ft. Jones, Calif.
”- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=87