Basionym Name:Ascidium exsertum Stirt., Proc. Roy. phil. Soc. Glasgow 11: 313 (1879)
Homotypic synonyms:Thelotrema exsertum (Stirt.) Zahlbr., Cat. Lich. Univers. 2: 617 (1923)Thelotrema exsertum var. exsertum (Stirt.) Zahlbr., Cat. Lich. Univers. 2: 617 (1923)