A highly branched and spiky lichen associated with coastal grassland and dunes. The widely divergent branches have pointed apices. The older branches may have a mottled appearance formed green areolate patches of algae on a white background

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
Ahti, Stenroos & Moberg. editors (2013) Nordic Lichen Flora. Volume 5 Cladoniaceae