New data on the genus Oxyrrhynchium (Brachytheciaceae, Bryophyta) in The Russian Far East

Abstract

The genus Oxyrrhynchium was known in the Russian Far East as represented by a single species, O. savatieri, revealed recently in the Kuril Islands. The finding of O. vagans, a much more southern species, in Primorsky Territory was unexpected. When sporophytes are present, this species is easily differentiated from most other species of the genus by smooth, not rough setae. However, specimens with sporophytes are rare in Oxyrrhynchium and without sporophytes their identification often cannot be certain. Thus we sequenced nrITS of other collections from the Russian Far East and China that lack sporophytes. One another specimen of O. vagans has been found among them, from the Kuril Islands. Oxyrrhynchium savatieri is found in a sister position to the group of species with strong costa, previously segregated into the genus Donrichardsia. No one of Chinese specimens identified as O. hians was found in the clade with O. hians samples from North America and Europe. РезюмеВидовое разнообразие рода Oxyrrhynchium на российском Дальнем Востоке было известно как представленное всего одним видом, O. savatieri, подтвержденным только по находкам с острова Шикотан на Курильских островах. Недавняя находка O. vagans, гораздо более южного вида, в Приморском крае оказалась неожиданной. Этот вид хорошо отличается от большинства видов рода гладкой ножкой. Без спорофитов, однако, уверенно различать виды Oxyrrhynchium не всегда возможно, в связи с чем видовую принадлежность таких образцов Oxyrrhynchium с Дальнего Востока мы проверили с помощью сиквенсов ДНК. В результате был выявлен еще один образец O. vagans с российского Дальнего Востока, с острова Шикотан. Образцы Oxyrrhynchium savatieri образуют граду к терминальной кладе гигрофильных представителей Oxyrrhynchium с мощной жилкой, которые ранее выделялись в особый род Donrichardsia. Ни один из образцов O. hians из Китая не оказался идентичным образцам этого вида из Европы и Северной Америки.

Oxyrrhynchium hians (Brachytheciaceae, Bryophyta) includes several morphologically distinct and cryptic species in northwestern Europe

“…si.edu/botany/codes-proposals/display_new.cfm; checked 7 March 2023). The well-known, apparently European-North American (Ignatov et al 2022), O. hians and its close relatives are pretty similar to each other in appearance, with at least some phenotypes having sparsely inserted stem leaves, complanate or sub-complanate ovate or oblong-ovate branch leaves, often with a strong costa, and, except in O. vagans (A.Jaeger) Ignatov & Huttunen, a rough seta. Ignatov and Huttunen (2002), Huttunen and Ignatov (2004) and Wynns et al (2009) all observed that several morphologically deviating aquatic species form a clade sister to the species around O. hians, and Wynns et al (2009) made some of the formal combinations for such species within Oxyrrhynchium.…”

“…Oxyrrhynchium hians, as currently understood in Europe, is highly variable morphologically and both subspecific and closely related species-level taxa have often been recognized (Limpricht 1895-1904, Brotherus 1923, Dixon 1924, Nyholm 1965. Further, based on nuclear ITS, Ignatov et al (2022) found two subgroups of O. hians. Considering the wide range of habitats inhabited and the wide morphologic variation in European O. hians, this suggests that it is worth exploring the species in more detail.…”

New records of rare and otherwise interesting mosses from The Ussurijsky State Reserve (Primorsky Territory, Russia)

“…Austin ex C.F. Parker, which are widespread and common in the area (results of this ongoing revision are partly disclosed in Ignatov et al, 2022). The same is true for East Asian Orthotrichaceae, which remain scarcely explored with the integrative taxonomic approach.…”