Fedosov V.E.1,2, Fedorova A.V.3, Ignatova E.A.1, Ignatov M.S.1,3 2025. On the genus Pterygoneurum (Pottiaceae, Bryophyta) in Russia // Arctoa. Vol. 34: 31-43 [in English].
1 – Lomonosov Moscow State University, Biological Faculty, Geobotany Dept., Moscow 119234 Russia. E-mails: fedosov_v@mail.ru, arctoa@list.ru; misha_ignatov@list.ri. ORCID (VF) 0000-0002-5331-6346; (EI) 0000-0001-6287-5660; (MI) 0000-0001-6096-6315
2 – Botanical Garden-Institute, FEB RAS, Makovskogo Street, 142, Vladivostok, 690024 Russia
3 – Tsitsin Main Botanical Garden, Russian Academy of Sciences, Botanicheskaya 4, Moscow 127276 Russia. alina_77777@mail.ru; ORCID 0000-0001-7362-2124
KEYWORDS: taxonomy, xerophiles, trnMV, rps4, hybridization
ABSTRACT. A partial taxonomic study of the genus Pterygoneurum with the focus on the Russian plants previously referred to P. lamellatum is conducted. In addition to morphological study, it includes a molecular phylogenetis analysis of the plastid rps4 and trnMV sequence data, which found in the genus three supported clades. The first one includes P. ovatum and Central European plants of P. lamellatum, the second is formed by European endemics P. papillosum and P. sampaianum, and the third includes P. subsessile, cleistocarpous P. kozlovii and P. sibiricum, and Russian plants referred to P. lamellatum, from two regions: the North Asia and the SE European Russia, the Caspian Lowland, which have distinct morphology. We suggest resurrecting the name P. arcticum for the ‘North Asian P. lamellatum’, which differs from the European P. lamellatum by the low lamellae that lack lateral outgrowths, and costa excurrent into a short awn. The second group of the ‘Russian P. lamellatum’, from the Caspian Lowland, is described as a new species, P. volgense. It has some characters common with a European P. lamellatum, i.e., recurved to revolute leaf margins, excurrent costae, exserted cylindric capsules with opercula possessing spiral cell rows, an occasional presence of peristome remnants, and a moderately large spores, but differs from it in having forked papillae on both leaf surfaces. Such morphology makes it distinct, though the studied phylogenetic markers in this group are low variable, not separating P. kozlovii, P. volgense, and one of the lineages of P. subsessile. A putative hybridogeneous speciation in Pterygoneurum is discussed, since some monophyletic groups in this genus include plants with a contrastingly different morphology, having at the same time a similar distribution.
doi: 10.15298/arctoa.34.03