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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A slightly tapered hairless stem swelling on Porophyllum gracile. According to Arizonensis.org a midge belonging to the genus Asphondylia was extracted from a gall like this, but another observation contained a caterpillar. This may be an inquiline. Observed in Arizona in October.
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value p-gracile-stem-swelling on iNaturalist. You can view them here: