Kidney shaped enlargements at base of needles of P. edulis, length 7 mm, diameter 4 mm, the walls thick and the needles rudimentary. [for sketch of gall, see p. 18]
”- EP Felt: (1917) Key to American Insect Galls©
Reference: https://www.biodiversitylibrary.org/page/8635512#page/22/mode/1up