Family: Lecanoraceae
Lecanora gangaleoides Nyl.
Type: Crustose
Common and widely distributed on siliceous rocks at coastal sites and also inland. Requires careful examination to separate it from the very similar Tephromela atra
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