in Lamarck & de Candolle, Fl. franç., Edn 3 (Paris) 2: 365 (1805).
Basionym: Lichen geographicus L., Sp. Pl. 2: 1140 (1753).
Photobiont: Trebouxioid green alga.
Chemistry: Several chemical races:
Ecology: On silicious rock.
Distribution type: Data lacking.
Taxonomy: Data lacking.
Note:
Distribution Database: Distributions
Distribution Database: Discover Life
Picture Database: Tropical Lichens
Molecular Database: Genbank
Synonym Database: Index Fungorum
Synonym Database: Mycobank
Race I: Rhizocarpic acid in the cortex, psoromic acid in the medulla.
Race II: Cortex Small amount of rhizocarpic acid in the cortex, much barbatic acid in the medulla (Scottland, Feuerer unpubl.).