Ivanova E.I.1, Bell N.E.2, Kuznetsova O.I.3, Ignatova E.A.4, Ignatov M.S.3 2015. The genus Polytrichum sect. Aporotheca (Polytrichaceae) in Russia // Arctoa. Vol. 24: 67–78 [in English].
1 Institute for Biological Problems of Cryolithozone of Siberian Division of Russian Academy of Sciences, 41 Lenin ave., Yakutsk, 677000, Russia;e-mail: firstname.lastname@example.org
2 Royal Botanic Garden, 20A Inverleith Row, Edinburgh EH3 5LR, UK; e-mail: N.Bell@rbge.ac.uk
3 Main Botanical Garden, Russian Academy of Sciences, Botanicheskaya 4, Moscow 127276 Russia; e-mails: email@example.com & firstname.lastname@example.org
4 Moscow State University, Biological Faculty, Geobotany Dept., Moscow 119234 Russia; e-mail: email@example.com
Keywords: Polytrichum, taxonomy, phylogeny, phytogeography, Russia, trnL-F, rps4
Abstract. Revision of herbarium collections and analysis of rps4 and trnL-F molecular sequence data supports the recognition in Russia of four species of Polytrichum sect. Aporotheca. Most specimens from the territory of Russia previously named as P. formosum are transferred to P. densifolium. The species status of the latter is resurrected and the distinction of P. formosum and P. densifolium is discussed. The four species are described based on the material from Russia, their distributions are summarised, diagnostic characters are illustrated, and a key to identification is provided.