Bryol. Europ.1: 151. 1846 ,
North America, Europe, Asia.
Species ca. 4 (3 in the flora).
A rare northern and alpine genus, Arctoa occurs on rock or soil and is distinguished by its medium-sized, Dicranum-like habit, with poorly differentiated stereid and guide cells. It may be confused with Kiaeria, which differs by a longer seta, and capsules often strumose, with narrow mouths.
|1||Peristome teeth not wide-spreading; distal leaf cells 1-2:1; costa short-excurrent.||Arctoa hyperborea|
|1||Peristome teeth wide-spreading; distal leaf cells 2-5:1; costa long-excurrent||> 2|
|2||Capsule straight, immersed; seta short; awn entire.||Arctoa anderssonii|
|2||Capsule curved, exserted; seta long; awn toothed.||Arctoa fulvella|