Dermatocarpon intestiniforme (Körb.) Hasse
A coastal and upland species biased towards the north-west. Repeatedly lobed, crowded, overlapping thallus attached to the substrate by numerous holdfasts.
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