Feron albicomus (Weld, 1952), comb. nov.

Gall (Fig. 12). The asexual monolocular, round, bristly pubescent galls are mostly on the underside and, sometimes, the dorsal surface of leaves. Galls are covered with short, stellate white hairs. Galls occur singly or in scattered groups along the edges of the leaves or near the midrib. Galls are 4 mm high and wide (Russo 2006, 2021; Weld 1952b, 1957).

Biology. The asexual generation is only known, which induces galls on Q. garryana (section Quercus, subsection Dumosae), the gall matures by October; adults emerge in April.

Distribution. USA: north California (Russo 2006, 2021; authors), Oregon (Burks 1979).

Andricus albicomus

Quercus garryana
Leaf galls, detachable
Fig 155. Covered with stellate hairs, 5 mm.

Fig 155. Q. garryana. On under side of leaf, 5.0 mm. in diameter covered with stellate whitish hairs. Adults emerged Apr. 1, 1950 from galls collected Oct. 14, 1948 (Caves Junction, Oreg.).

Andricus albicomus, new species

Gall:
A thin-walled conical gall about 5 mm. in diameter on the underside of a leaf in the fall, densely covered with pedicelled, stellate grayish-white hairs. Inside is a transverse basal larval cell with a distal cavity opening at apex.

Host:
Quercus garryana

Bristle-Gall Wasp
Andricus albicomus

This cynipid wasp induces monothalamous, round, bristly galls, mostly on the underside, and sometimes on the dorsal surface, of Oregon oak leaves.