Basionym Name:Pyrenopsis reducta Th. Fr., Bot. Notiser: 57 (1866)
Homotypic synonyms:Gloeopyrenia reducta (Th. Fr.) Zahlbr., in Keissler, Rabenh. Krypt.-Fl., Edn 2 (Leipzig) 9(1.2): 436 (1937)Protothelenella reducta (Th. Fr.) Räsänen, Ann. bot. Soc. Zool.-Bot. fenn. Vanamo 18(no. 1): 102 (1943)