Found on nutrient enriched rocks in coastal locations. Very similar to X. parietina. Rarely fertile and characterised by sparingly overlapping, discrete, crenulate-indented to strap-shaped lobes

Determiner: 
Chris 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