Phylloxera falsostium Hamilton, sp. n.

Hosts: Carya cordiformis

Galls: Round and convex, yellowish-green and somewhat transparent, with or without slit-like opening in middle, and rim formed around circumference on adaxial leaf surface; more raised above than below; round, pubescent, light green and much lighter compared to adaxial leaf surface, and sunken below surface with rim formed around circumference on abaxial leaf surface.

Round and convex or slightly sunken below leaf surface with a distinct rim above and yellowish-green; diameter 2.3–4.5 mm; with or without an apparent slit-like opening in middle which leads down into a false chamber; below round, pubescent, almost white, and sunken below leaf surface with a rim around circumference. Opening below round and surrounded by white pubescence which splits into 5–6 small bracts at maturity.

[A figure of the gall appears on page 135 of the pdf. A discussion of how to distinguish this gall from the similar P rimosalis appears on page 87.]

Range: OK

- Fredericka Blair Hamilton: (2019) Species Diversity of Hickory-feeding Phylloxerans (Hemiptera: Phylloxeridae) in the U.S.^©