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 swellings on the twig ends of Frangula californica. The galls are thin-walled, and contain frass, indicating it may be induced by a sawfly, moth or beetle. Observed in California in October. A cross-sectioned gall in California revealed a moth caterpillar.
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value f-californica-tapered-twig-gall on iNaturalist. You can view them here: