Vahliella atlantica (P.M. Jørg. & P.W. James) P.M. Jørg.
Forms an irregular, spreading crust of dark grey squamules, which is partly isidiate. A rarely recorded coastal species of the north-west. Found on soil and rock crevices in shade, often in coastal locations.
This species has a restricted distribution and is listed as Nationally Rare and a Priority Taxon for Biodiversity in Scotland
Smith et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson (2018) Lichens: an Illustrated Guide to the British and Irish Species