Ann. Bot. Fenn. 26: 160 (1989).

Type locality: Finland, Etelä-Häme, Ylöjärvi, Pengonpohja, 1905, A. A. Sola s.n. (H - holotype; BM - isotype).

Chemistry: Usnic acid, barbatic acid, TLC, Denmark (Aptroot 2000: 27).