Cladonia humilis (With.) J.R. Laundon
A coastal species found in sandy areas where it forms a a patch of large rounded basal squamules. the grey-green podetia are short and the cups do not proliferating from the rim.
Smith et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson (2018) Lichens: an Illustrated Guide to the British and Irish Species
Ahti, Stenroos & Moberg. editors (2013) Nordic Lichen Flora. Volume 5 Cladoniaceae