Basionym Name:Catapyrenium norvegicum Breuss, in Breuss & Hansen, Pl. Syst. Evol. 159(1-2): 100 (1988)
Homotypic synonyms:Placidium norvegicum (Breuss) Breuss, Annln naturh. Mus. Wien, Ser. B, Bot. Zool. 98(Suppl.): 39 (1996)