Basionym Name:Porocyphus groenlandicus E. Dahl, Meddr Grønland, Biosc. 150(no. 2): 53 (1950)
Homotypic synonyms:Thelignya groenlandica (E. Dahl) Henssen, in Henssen & Jørgensen, Lichenologist 22(2): 145 (1990)