Leaf, under side, distal ⅔ of gall dome-shaped with 3-many triangular
sides, the flaring base resting on the proximal, constricted or
saucer-shaped ⅓; 2-3 mm. high, 3-4 mm. wide. Tip attenuate, not sharp
pointed, however. Light green to yellowish green, the tip darker,
reddish to black. Surface smooth under lens. Larval chamber spherical,
surrounded by sclerenchmya layer. This gall is very distinctive no
other forms having the peculiar angular structure which it possesses.
Not abundant.
Collected at Gypsum, Ohio, August, on _H. microcarpa_.
Type specimens at Ohio State University.