Annls Sci. Nat., Bot., Sér. 3, 5: 262 (1846).

Type locality: Without locality.

Tibell, L., 2003: Tholurna dissimilis and generic delimitations in Caliciaceae inferred from nuclear ITS and LSU rDNA phylogenies (Lecanorales, lichenized ascomycetes). - Mycol. Res. 107 (PT 12), 1403-1418 (2003).

Thallus: Data lacking.

Photobiont: Data lacking.

Chemistry: Acroscyphan (Huneck & Yoshimura 1996: 131), Zeorin, calycin, gyrophoric acid, two unknown substances (Singh & Sinha 2010: 68).

Ecology: On nutrient-rich rocks in open situations at high altitudes, mainly above 3000 m, except in high latitudes, where it descends to lower levels (Tibell 1996: 15).

Distribution Type: Global but very scattered.