Cladonia chlorophaea (Flörke ex Sommerf.) Spreng.
Commonly found at the base of trees, rotting logs and stumps, on mossy banks and coastal dunes. It is considered to be a complex of species or chemotypes which are difficult to distinguish. The podetia expand smoothly to form a wide cup which may have marginal projections
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
Ahti, Stenroos & Moberg. editors (2013) Nordic Lichen Flora. Volume 5 Cladoniaceae