Andricus sp.
Lobed-gall wasp
Hosts: Quercus cornelius-mulleri
These monothalamous galls occur in large numbers on the underside of leaves of Muller's oak. Fresh galls are usually smooth, rose-brick red fading to a light yellow at the lobed tips.
Range: Santa Rosa Mountains, CA
”- Russo, Ronald A. : (2021) Plant Galls of the Western United States©