Ignatova, E.A., O.I. Kuznetsova, A.V. Fedorova & M.S. Ignatov. 2022. The genus Pseudoleskeella (Bryophyta) in Russia

Arctoa (2022) 31: 7–16

doi: 10.15298/arctoa.31.02

A taxonomic revision of the genus Pseudoleskeella in Russia has been addressed at the species level. Molecular phylogenetic analysis found a quite separate position of P. tectorum and P. nervosa, while P. rupestris, P. catenulata and P. papillosa appeared to be rather closely related. Pseudoleskeella rupestris is an extremely variable species in Russia, comprised partly by plants with short double or forked costa in some leaves which makes difficult its differentiation from P. tectorum; such morphotypes are described as P. rupestris var. tenuis. In the Pseudoleskeella catenulata-clade one specimen from Sakhalin was found contrastingly different by morphology, having very long acuminate leaves and only moderately thick-walled cells. It is described as a new species, P. saсhalinensis. Thus, the genus Pseudoleskeella is represented in Russia by six species and one variety.