Family: Lecanoraceae
Lecanora sulphurea (Hoffm.) Ach.
Type: Crustose
A thick, cracked-areolate crust, variable in colour from true sulphur to yellowy-green. Common on coastal silica-rich rocks
References:
Smith, C.W. et al. editors (2009) The Lichens of Great Britain and Irelandd
Dobson, F.S. (2018) Lichens: an Illustrated Guide to the British and Irish Species