On leaf, under side, obconic gall resting in firm collar-like base.
Somewhat similar to 31, but differs in definite constant characters to
make it distinct. Proximal end not rounded but definitely conic, distal
broad end with prominent fovea in the center of which arises a well
defined nipple. Dia. across top, 2½ mm., height from leaf surface, 2
mm. Greenish to reddish brown, smooth. No prominence or convexity of
leaf surface opposite the gall, a slight discoloration only marking the
position of the cecidium.
Collected in Hocking County, Ohio, on _H. microcarpa_, July.
Type specimens at Ohio State University.