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.
Cynipid galls of the eastern United States
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Quercus stellata
Acorn galls
Probably from separate cells inside a mature acorn. Sp.#82 in Andricus.
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value q-stellata-inside-mature-acorn-gall on iNaturalist. You can view them here: