On leaf, under side, large galls with globular basal part extending
into a point distally. Shape suggests that of a Prince Rupert’s drop.
4-7 mm. long. Surface very smooth, greenish to reddish tinged. Some
show a definite blue color over the attenuate apical end. Walls of
medium thickness, very firm. Somewhat similar to _C. sanguinolenta_
O. S. but differs from that gall in its larger size and much more
attenuate distal end. Common on different hickories.
Osten Sacken, Lowe’s Mongr. Dip N. Am. Pt. 1, p. 192. 1862.
Felt, Jour. Econ. Ent. 4:456. 1911.