WELD 405. Plate 37, fig. 32.

Host. — Quercus rubra Linnaeus and Quercus nigra Linnaeus.

Gall. — A polythalamous, somewhat globose, gall with a smooth brown surface, 15 mm. in diameter, attached at the crown and hidden under humus. When mature the epidermis disintegrates revealing a cluster of whitish, longitudinally ridged, relatively large woody cells.

Habitat. — Old galls were collected at Ironton, Missouri, on Quercus rubra October 5, 1917, and at Gainesville, Florida, October 23, 1919, on Quercus nigra.