Quercus chrysolepis
Leaf galls, integral
Similar [to this gall] with a free-rolling cell inside. On new leaves in spring.
- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=62&skin=2021