Basionym: Jungermannia sudetica Nees ex Huebener (1834: 142). Type: in den Sudeten im Metzgergrund. Lectotype (designated by Grolle 1971: 262): POLAND: "Sudeten", Riesengebirge, Melzergrund ("Metzgergrund"), Nees s.n. (STR, sub Jung. alpestris)
Synonyms:— Lophozia debiliformis Schuster & Damsholt (1987: 326). Holotype: GREENLAND: Kangikitsoq Fjord, R. Schuster & K. Damsholt RMS & KD 82-1798 (herb. Schuster), syn. nov.
Lophozia debiliformis var. concolor Schuster & Damsholt (1987: 326). Holotype: GREENLAND, Christian IV's Ø, Tasiussaq, R. Schuster & K. Damsholt RMS & KD 82-1645 (herb. Schuster), syn. nov.
Note:— Barbilophozia sudetica is a very variable species. Lophozia debiliformis is an expression with unusually large underleaves, and due to this it has sometimes been placed in Protolophozia (Schuster 1968: 474) Schljakov (1979: 204). Lophozia debiliformis seems to be a common expression of the species both in the Alps and in Scandinavia, probably also elsewhere. However, as there exist many intermediate forms we here synonymize them.