Atlas of North European vascular plants
Hultén & Fries 1986
1508 Lomatogonium rotatum (L.) Fr.
This rather variable species belongs to the circumpolar plants (Hultén, Circumpol. Il, p. 58 and map 49). The distribution is, however, discontinuous. Cf. also Meusel et al. 1978, map p. 356.