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.
Plant Galls of the Western United States
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Unknown #40
Stem-gall wasp
Quercus grisea
Galls of this wasp occur on branches of gray oak and are round to ovoid, with a slight clasping base where connected to the host branch.
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value q-grisea-stem-gall on iNaturalist. You can view them here: