Forms a stiff cushion of notched, basal squamules, typically pale bronze-green above, white below. Identification confirmed by the diagnostic bright emerald-green reaction with sodium hypochlorite. This is the only UK species to give this C+ reaction. Mostly on wet peat on heaths and moorlands

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