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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Thin, mitten-shaped hairless galls usually occurring in great numbers on the undersides of leaves of Amelanchier alnifolia. The galls are usually purple, but have also been seen with orange and yellow. There may be some overlap with the a-arborea-spotted-fan-gall.
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value a-alnifolia-skinny-mitten-gall on iNaturalist. You can view them here: