Quercus kelloggii
Stem galls, woody stem swellings or cells under bark
Elongated cells, 2.3 by 1.0 mm, under leaf scar, in slight terminal swelling.
- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=67&skin=2021