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
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Tapered stem swelling
Swellings are 1-2cm long and turn woody in the fall.
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value p-pumila-stem-swelling on iNaturalist. You can view them here: