Lithocalla Orange gen. nov.
MycoBank number: MB 836548; Index Fungorum number: IF 836548; Facesoffungi number: FoF 13334;
Thallus crustose, leprose, diffuse, arising from aggregations of separate granules, eventually forming a cracked crust; lower parts of thallus comprising decolourized granules, medulla and hypothallus not developed. Prothallus occasionally seen in shade, sparse. Photobiont a green alga. Ascomata and conidiomata unknown.
Type species: Lithocalla ecorticata (J. R. Laundon) Orange.
Phylogenetic placement: Ascomycota, Lecanorales, Ramalinaceae.
Chemistry: Usnic acid, atranorin (accessory), stictic acid (acces- sory), fatty acids, terpenoids.
Etymology: Derived from the Greek nouns Lithos (stone) and Callos (beauty), a reference to the beautiful pale yellow colonies dusting rock overhangs. The name has a Latin termination, and should be treated as feminine.