Diastrophus p-congesta-stem-gall
The inducer of this gall is unknown or undescribed.
Family: Cynipidae | Genus: Diastrophus
Hosts: Potentilla congesta
Detachable: integral
Color: green
Texture: hairy
Abundance:
Shape:
Season: Summer
Related:
Alignment: integral
Walls: thick
Location: stem
Form: abrupt swelling
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.
Field Guide to the Herb and Bramble Gall Wasps of North America
“
Presumed Diastrophus sp.
Host: Sierra horkelia (Horkelia congesta congesta).
Gall location: On the stems.
Range: Thus far reported from Oregon.
An unknown stem gall has been recorded on a subspecies of Sierra horkelia that is endemic to the Willamette and Umpqua Valleys in Oregon. The true inducer of this gall is unknown, but dissections of several galls have yielded what appear to be gall wasp larvae. Further research will determine the identity of this gall in the near future.
”- Louis Nastasi, Charles Davis: (2022) Field Guide to the Herb and Bramble Gall Wasps of North America©
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See Also:
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value p-congesta-stem-gall on iNaturalist. You can view them here:
