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Alder erineum mite
Acalitus brevitarsus
Acalitus brevitarsus is an eriophyid mite which induces domed, blister like swellings, known as galls. on some species of alder (Alnus species).
From the article Acalitus brevitarsus on Wikipedia (CC BY-SA), quoted section by section
Description
A pale, slightly domed swelling on the upper surface, which is induced by mites living and feeding within erineum (hairs), on the lower surface. The hairs are white or yellowish at first, later rust-brown and when viewed with a hand lens, the erineum look like a mat of shiny, glass-like hairs. In the autumn the mites spend the winter in old cones and bark crevices. This gall is found on Italian alder (Alnus cordata), European alder (Alnus glutinosa), grey alder (Alnus incana), Alnus x pubescens and Alnus viridis.
Similar species A fungus, Taphrina sadebeckii, can look similar on the upper surface.
Wikipedia: “Description of the gall”
Where it lives
Recorded sightings
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geo-referenced records in GBIF, from museums, herbaria and field observers.
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In the stacks
Searching the stacks…
Every page naming Acalitus brevitarsus in the Biodiversity Heritage Library →
This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 334080.