A widespread species especially on western coasts. Found on wet rocky ledges and crevices. the foliose thallus is attached by a central holdfast. Pale grey to brown and dotted with ostioles of perithecia

Determiner: 
Christine Johnson

References: 
Smith et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson (2018) Lichens: an Illustrated Guide to the British and Irish Species
Moberg et al. editors (2013) Nordic Lichen Flora, Volume 6: Verrucariaceae 1