Ignatova, E.A., A.V.
Fedorova & M.S. Ignatov. 2020. On the genera Isopterygiopsis
and Isopterygiella, gen. nov. (Plagiotheciaceae)
in
Arctoa
(2020) 29: 49–62
doi: 10.15298/arctoa.29.03
The results of molecular phylogenetic
analysis and morphological characters suggest that Asian plants previously
referred to Isopterygiopsis muelleriana are not conspecific with
European plants of this species. The description of Orthothecium
catagonioides Broth. clearly fits character combination of Asian plants.
This name was synonymized with Isopterygiopsis muelleriana when the
genus Isopterygiopsis Z. Iwats. was established. We resurrect it and
make a new combination in Isopterygiopsis. Molecular markers also
demonstrate that I. muelleriana and I. catagonioides do not group
with I. pulchella and I. alpicola. Therefore we establish a new
genus, Isopterygiella, for the latter two species. Descriptions of
genera Isopterygiella and Isopterygiopsis and their
comparison are given; descriptions, illustrations and distribution data are
provided for two species of Isopterygiopsis. Isopterygiopsis
muelleriana is known in Russia from two localities in the Caucasus and one
disjunct locality in the Russian Far East; I. catagonioides is common in
Asian Russia, while in its European part it was found only in the Polar Urals.