Quercus wislizeni
Stem galls, woody stem swellings or cells under bark
Cells in thickened bark on one side causing twig to bend back. Fig 63.
Fig 63. Stem swelling on new growth May 17 (Shasta). Q, wislizeni.
”- LH Weld: (1957) Cynipid Galls of the Pacific Slope©
Reference: https://babel.hathitrust.org/cgi/pt?id=coo.31924018313555&view=1up&seq=81