Bot. Zeitung (Berlin) 19: 352 (1861).

Basionym: Cladonia alcicornis var. firma Nyl., Syn. Meth. Lich. 1: 191 (1860).

Protolog: Data lacking.

Type locality: Portugal, Algarve, Marim, 1951, C. N. Tavares in Tavares: Lich. Lusit. Sel. Exs. 39 (H - neotype; LISU, UPS - isoneotypes). Neotypification by Ahti (1993: 77).

Chemistry: Atranorin, fumarprotocetraric acid (Etayo & Burgaz 1997: 722).