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.
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.