Lichenologist 4(4): 299 (1970).

Basionym: Lichen ochroleucus Neck., Method. Muscor.: 52 (1771).

Chemistry: var. porphyrium (Pers.) Zopf: Atranorin, a triterpenoid (? zeorin) but no porphyrillic acid (Topham & Walker 1982: 64).

Note: Some authors distinguish a var. porphyricum (Wirth et al. 2001: 40). Others do not (Clerc 2004: 114).