Phylloxera wiedenmanni Hamilton, sp. n.

Hosts: Carya cordiformis

Galls: Round or oval, convex, with pubescent yellowish-green circumference and transparent light yellow depression in center, occurs above plane of leaf or slightly sunken below plane forming a rim around it on adaxial leaf surface; round or oval, convex, constricted at base, light green, pubescent, and with round opening surrounded by 6-7 pubescent bracts on abaxial leaf surface.

Button-like and with a depression in center; more convex above than below; occurs above plane of leaf or slightly sunken below plane forming a rim around it; circumference light green and pubescent; depression almost white or yellow and translucent; diameter 5.0–9.1 mm; below round or oval, light green, and pubescent.
Opening below round and surrounded by 6–7 pubescent bracts.

[A figure of the gall appears on page 152 of the pdf. A discussion of how to distinguish this gall from the similar P foveola appears on page 109.]

Range: OK, TX