Stereocaulon cumulatum comb. nov., another crustose species in the genus

The new combination Stereocaulon cumulation (Sommerf.) Timdal is made for the northern Eurasian and Greenlandic, arctic-alpine, terricolous lichen presently known as Toninia cumulata (Sommerf.) Th. Fr. (C) 2002 The British Lichen Society.