Konstantinova N.A.1, Vilnet A.A.1, Mamontov Yu.S.2 2025. Molecular phylogenetic study of the genus Isopaches with description of a new species from South America // Arctoa. Vol. 34: 152-164 [in English].
1 – Polar-Alpine Botanical Garden-Institute of the Kola Science Center of RAS, Kirovsk, Murmansk Region, 184256, Russia. Emails: nadya50@list.ru, anya_v@list.ru. ORCID: (NK) 0000-0002-7600-0512; (AV) 0000-0001-7779-2593
2 – Tsitsin Main Botanical Garden of the Russian Academy of Sciences, Moscow, Russia, 127276. E-mail: yur-mamontov@yandex.ru. ORCID: 0000-0003-3851-0738
KEYWORDS: liverworts, molecular analysis, morphology, phylogeny, systematics, distribution, hybrid origin, ITS1-2 nrDNA, trnL-F, rbcL, psbA-trnH cpDNA
ABSTRACT. This is the first molecular phylogenetic study of the genus Isopaches based on a large set of specimens from numerous remote regions of Eurasia and North America. Along with three previously known species, it includes a new species from South America – I. valdiviensis. The latter is formally diagnosed, illustrated, and compared to similar taxa, including another southern hemisphere species, I. pumicicola. We have shown that the genus Isopaches is a group of closely related and slightly divergent taxa and revealed a possible hybrid relation between I. bicrenatus and I. alboviridis. The main morphological differences of the species including sex allocation, leaf width/length ratio, shape of gemmae etc., are discussed. Overlap in some of these characters in different species is shown. A key to all species of the genus is provided.
doi: 10.15298/arctoa.34.12