Single or in groups of up to 25. Sessile with a smooth brown basal part clasping the twig, the top enlarged, rugose, dull, and darker in color, probably secreting honeydew when young.
Larval cell basal.
”- LH Weld: (1957) New American Cynipid Wasps From Oak Galls©
Reference: https://www.biodiversitylibrary.org/page/37074612#page/143/mode/1up