Dactylosphaera depressum, n. sp.
Gall No. 4

Hosts: Carya alba [tomentosa]

These galls were found to be exceedingly numerous on some trees. On June 20th, they were smooth, slightly rounded above, pale yellowish-green; beneath somewhat whiter, and having in the centre a nipple-like projection; opening round, surrounded with a burr- like fringe composed of many filiments,the cavity like an inverted cone, the wall above being quite thin and translucent, so that the inmates may be seen moving about. This apparently very flat gall was placed as much below as above the plane of the leaf. Diameter .15 — .25 inch ; vertical thickness .125 inch.

Phylloxera depressa (Shimer)

Galls on leaves of Carya alba (= ovata) in Illinois, USA are numerous, smooth, diameter 4-6 mm, convex and pale yellowish green above leaf, whiter beneath with a central nipple-like projection and a round opening. Alatae are present in the gall in late June (Shimer 1869). The life cycle is unknown. According to Riley (1875), conifera Shimer is a synonym.

Phylloxera depressa

Carya sp.
Conical or globose leaf galls with distinct orifice and containing aphids
Gall medium, the walls papery, slightly convex above and beneath with a short nipple, having a rounded orifice surrounded by a burlike fringe of many filaments, diameter 3.8 to 6.2 mm, height 3 mm.

Phylloxera depressa. Shimer.

Dactylosphaera depressum Shimer.

Not having had an opportunity of seeing this gall, I am unable to form an opinion as to its specific value and reproduce, therefore, the description as given by Shimer:

"These galls were found to be exceedingly numerous on some trees (Carya alba [Carya tomentosa]). On June 20th they were smooth, slightly rounded above, pale yellowish-green; beneath somewhat whiter, and having in the centre a nipple-like projection ; opening round, surrounded with a burr-like fringe composed of many filaments, the cavity like an inverted cone, the wall above being quite thin and translucent, so that the inmates may be seen moving about. This apparently very flat gall was placed as much below as above the plane of the leaf. Diameter .15-. 25 inch [3.8-6.2 mm]; vertical thickness .125 inch [3 mm]. "

Phylloxera depressa

Round and smooth above, light yellowish-green, and diameter 3.8–6.2 mm; about equally convex above and below; below lighter with a nipple-like opening surrounded by many bracts.