Orhotrichum holmenii Lewinsky-Haapasaari (Orthotrichaceae, Musci), a new species for Russian moss flora

Abstract

Orthotrichum holmenii Lewinsky-Haapasaari is found in Russia for the first time, in European Arctic (Adzva River, Nenetzky Autonomous District) and Siberian Subarctic (Maimecha River, the southern Taimyr). Previously the species was known only from the type locality in Kazakhstan, vicinity of Alma-Ata, 3400 km and 3000-3400 km from the new localities. The description, illustrations and differentiation from similar species are provided. Orthotrichum holmenii differs from other species of the genus by the combination of naked calyptra, exserted, distinctly ribbed capsules with stomata slightly to moderately covered by subsidiary cells, exostome teeth reflexed when dry and not paired when old, and 16 long papillose endostome segments. РезюмеOrthotrichum holmenii Lewinsky-Haapasaari впервые найден в России в двух местонахождениях: в европейской Арктике (р. Адзьва, Ненецкий автономный округ) и Восточносибирской Субарктике (р. Маймечи, южный Таймыр). Ранее этот вид был известен только из типового местонахождения (Казахстан, окрестности Алма-Аты) в 3000-3400 км от новых местонахождений. Приводятся описание и иллюстрации образцов из России, рассматриваются отличия от близких видов. От прочих видов рода O. holmenii отличается следующей комбинацией признаков: колпачок голый, коробочка ребристая, поднятая над перихецием, с устьицами, слабо или умеренно прикрытыми побочными клетками, зубцы экзостома отогнутые в сухом состоянии, не сближенные попарно после рассеивания спор, сегментов эндостома 16, длинных, папиллозных.

On the two poorly known Orthotrichum species from north Asia

“…In particular, according to the protologue, O. sibiricum has dirty blackish green leaves (due to growth in occasionally flooded habitats), emergent capsules, stomata half-covered by the subsidiary cells, teeth fused in 8 pairs, splitting during spore release, and 16 slightly appendiculate endostome segments of equal length. All these characters are cosistent with the description and illustrations provided by Fedosov et al (2009) for O. holmenii and nearly identical illustrations were made by Lewinsky-Haapasaari (1996) from the type specimen(s) of O. holmenii, though gemmae do not occur in every northern specimen. In addition, according to the protologue, O. sibiricum grows on Alnaster and Salix trunks near streams, and just in the same conditions all Russian specimens of O. holmenii were collected.…”

“…Further inflating of morphological circumscriptions of European species seemed to be inappropriate, so we started to search for more relevant names for north Siberian taxa. Plants with well emergent to shortly exserted capsules, 16 exostome teeth and 16 endostome segments of the equal length, growing on silt-covered willow bases in river valleys were identified as O. holmenii LewinskyHaapasaari (Fedosov et al, 2009). This species was described based on three specimens from Kazakhstan (Lewinsky-Haapasaari, 1996), but later it was considered to be conspecific with O. scanicum (Medina et al, 2009).…”

“…The description and illustrations for this species were published recently by Fedosov et al (2009), thus not repeated here. Additional localities of this species were reported later by Ignatov et al (2014), Fedosov et al (2011, Afonina et al (2017).…”

On four Orthotrichaceae species new for Russia

“…Recent field studies in poorly explored areas of the Caucasus and Siberia, as well as a revision of herbarium collections brought some records of previously neglected species (Fedosov et al, 2009, Fedosov & Ignatova, 2011, and also previously undescribed O. dagestanicum . Most of new findings were made during an extensive revision of herbarium material in the course of preparation of the fourth volume of "The moss flora of Russia".…”

On Orthotrichum pellucidum and O. hallii in Russia

“…The genus Orthotrichum is still waiting for such a revision in Russia. However, several of its species new for the Russian moss flora have been revealed recently (Ignatov & Levinski-Haapasaari, 1994;Akatova et al, 2004;Fedosov et al, 2009) and two species were described as new for science: O. furcatum T. Otn. (Otnyukova, 2001) and O. dagestanicum Fedosov & Ignatova (Fedosov & Ignatova, 2010).…”