Pemphigus rileyi
The inducer of this gall is unknown or undescribed.
Hosts: Populus tremuloides
Detachable: integral
Color: red, yellow
Texture:
Abundance:
Shape: conical, globular, cluster
Season:
Related:
Alignment: integral
Walls: thin
Location: petiole, upper leaf, lower leaf, leaf midrib
Form:
Cells:
Possible Range:i
Common Name(s):
Synonymy: 
Image by FA Stebbins © Public Domain / CC0Our ID Notes may contain important tips necessary for distinguishing this gall from similar galls and/or important information about the taxonomic status of this gall inducer.
Insect galls of Springfield, Massachusetts, and vicinity
“
Pemphigus? rileyi n. s.
A spherical, red and yellow gall occurring in clusters, usually on the under side of the leaf, near the petiole. Above there is a conical projection at the top of which is the opening. Thin-walled. About 5 mm. in diameter. On aspen, Populus tremuloides. Rather common.
”- FA Stebbins: (1910) Insect galls of Springfield, Massachusetts, and vicinity©
Reference: https://www.biodiversitylibrary.org/item/71437#page/13/mode/1up
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