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.
Gallformers ID Notes
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Tapered stem swellings on twigs of Physocarpus opulifolius. Old galls observed in May in Illinois.
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value p-opulifolius-stem-swelling on iNaturalist. You can view them here: