A new species, Dicranum pseudacutifolium Otnyukova
is described from North Siberia, Putorana Plateau. It is similar to D.
acutifolium and D. brevifolium but differs from both species in the
absence of bulgings above cell walls as it is seen on transversal leaf section,
in not porose lower leaf cells, and in inner perichaetial leaves abruptly
contracted into subula. It differs from D. flexicaule and D. fuscescens
in leaf cross section looking like pair of tongs, and from the latter also in
relatively scarce rhizoids, and in wide leaf base. A specific feature of this
new species is straight cell walls making cell angles sharp, not rounded.