Umbilicaria crustulosa (Ach.) Lamy

Bull. Soc. Bot. Fr. 25: 386 (1879) [1878].

Basionym: Gyrophora crustulosa Ach., Lich. Univ.: 673 (1810).

 

Note: Authorities until recently (Ach.) Frey, e.g. in Index Fungorum, and all checklists.