Cystiphora canadensis
The inducer of this gall is unknown or undescribed.
Family: Cecidomyiidae | Genus: Cystiphora
Detachable: integral
Color: green, purple
Texture:
Abundance:
Shape: numerous
Season: Summer
Related:
Alignment: integral
Walls:
Location: between leaf veins
Form: leaf spot
Cells:
Possible Range:i
Common Name(s):
Synonymy: 
Our 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.
The plant-feeding gall midges of North America
“
Prenanthes
Flat, ovoid, purplish leaf blister...Cystiphora canadensis Felt
Galls are approximately 3–5 mm in diameter...Hosts: P. alba, P. altissima, P. serpentaria.
”- Raymond J. Gagne: (1989) The plant-feeding gall midges of North America©
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