Ignatov, M.S., Yu.S. Ishchenko & O.I. Kuznetsova. 2022. The genus Jochenia (Bryophyta) in Russia

Arctoa (2022) 31: 34–43

doi: 10.15298/arctoa.31.05


Jochenia pallescens s.l., commonly known as Hypnum (or Stereodon) pallescens has been treated as a monospecific group. Some authors, however, distinguished a second species, most commonly called Hypnum reptile, while other authors accepted it as a variety of H. pallescens. Recent molecular phylogenetic studies proved the existence of two genetic entities within Jochenia. One species, J. pallescens, is widespread in the Holarctic, whereas the distribution and morphological delimitation of another species, J. protuberans, were not clear. The present study addresses the elucidation of morphological distinctions and geographical distributions of these two species. Jochenia protuberans is likely confined to the areas with humid climate. It occurs in the Russian Far East in Kamchatka, Kuril Islands, Sakhalin Island, and in Baikal Lake area, in the Khamar-Daban Range, in humid sites at high elevations. It also occurs in mountains of Central Europe, Caucasus, and Canada (Quebec). Distinctions between the two species of Jochenia are numerous both with the gametophyte and the sporophyte, but occasional intermediates between them are found, being probably hybrids between these two species.