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.

Disholcaspis prehensa Weld.

Quercus dumosa, durata
Stem galls, detachable from the twig
Fig 89. Base clasping, top enlarged, rugose.

89. Q-dumosa and durata. Sessile with a sharp-edged clasping base. Contained full-grown larvae Sept. 9 (Sequoia National Park). Adults were cut out Jan. 25.

Clasping-Twig-Gall Wasp Disholcaspis prehensa
This cynipid wasp induces monothalamous, mushroom-shaped stem galls on scrub and leather oaks.