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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Cecidomyiid
Swollen petiole
All that is known of this species is that it forms an irregular gall about 12 mm in length.
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value c-pumila-swollen-petiole-gall on iNaturalist. You can view them here: