Leaf, under side, depressed (door-knob-shape) closely sessile on leaf
attached by a very short stout pedicel. 3-4 mm. wide, 2-2½ mm. high.
Greenish to dull brown, covered with short, thin pubescence or smooth.
Interiorally from both the proximal and distal sides, truncated,
conic processes extend inward, meeting in the center. From the end of
the upper one numerous, very coarse trichomes radiate into the gall
chamber, which are white at first, turning brown. The central tissue
and the walls are of a firm, fleshy character. There is commonly a more
or less definite fovea, exteriorly at the distal end.
Collected in southern (Hocking County) and northern (Lake County) Ohio
on _H. ovata_.
Thompson briefly describes and illustrates a gall similar to the above
which Felt as editor called _Caryomia thomsoni_. The illustration,
however, shows the gall not be to Felt’s _C. thompsoni_ as he has
described it, viz., “Globose, with long, erect, reddish, fuscous hairs.”
Felt, Bull. Brooklyn Ent. Soc. 8:99. 1913.
Thompson, Illus. Cat. Am. Ins. Galls, p. 56, pl. 12, Fig. 227.