This species was described from a wasp. No gall was apparently associated with it by Weld's 1928 book, and it's not clear when if ever the gall was described. Weld's 1959 catalog lists the wasp associated with a fall leaf gall on Quercus alba he describes as a "depressed sphere . . . with a white bloom." This description is accompanied by a drawing that suggests a thick-walled spangle gall broadly similar to Phylloteras poculum or rubinum. Weld's drawing differs from P rubinum in being placed between rather than on veins and in having its larval cell at the apex rather than base of the gall. If galls like Weld's drawing have been observed, they have been identified as P poculum. The gall specimens labeled as Phylloteras nigrum (Fitch, 1859) in the US NMNH collection do not agree with Weld's drawing and seem to be galls of Atrusca quercuscentricola. Several specimens are labeled as coming from hosts not listed for P nigrum, and some galls seem labeled as such. In the absence of reliable museum specimens or recent observations of plausibly matching galls, this species seems dubious.

- Gallformers Contributors: (2024) Gallformers ID Notes^©