Ramalina calicaris (L.) Fr.
Shiny grey-green thallus, narrow divided branches with up-turned edges forming a single deep channel. Apothecia at or near the branch tips. More common in the west and often coastal. Grows on basic bark and twigs
Smith et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson (2018) Lichens: an Illustrated Guide to the British and Irish Species