Basionym Name:Synechoblastus flaccidus f. dilutior Stein, in Cohn, Krypt.-Fl. Schlesien (Breslau) 2(2): 359 (1879)
Homotypic synonyms:Collema rupestre f. dilutius (Stein) Zahlbr., Cat. Lich. Univers. 3: 60 (1924)