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Biodiversity studies Botanica Pacifica. A journal of plant science and conservation 2025. Preprint Article first published online: 15 OCT 2025 | DOI: 10.17581/bp.2025.14210 New data on the Porellaceae (Marchantiophyta) in Russia Ksenia G. Klimova Botanical Garden-Institute FEB RAS, Vladivostok, Russia In the course of preparing the monograph on the liverwort flora of the Russian Far East, two species of the Porellaceae were newly found in this area. Porella japonica is first reported for the Russian Federation; the species has the northernmost location worldwide there. Porella cordaeana is recorded for the Russian Far East for the first time. The molecular genetic analysis indicates that the studied specimens are genetically closer to the North American accessions of the latter species, rather than the European ones. To date, the known diversity of Porellaceae in the Russian Far East counts 13 species that significantly exceeds its diversity in the rest of Russia. The paper provides morphological descriptions of both species based on the Far Eastern materials, line drawings, and photographs, including those made on living plants. Климова К.Г., Бакалин В.А., Мальцева Ю.Д. Дополнения к Porellaceae (Marchantiophyta) в России. В рамках продолжающейся работы по подготовке флоры печеночников российского Дальнего Востока были впервые обнаружены два вида семейства Porellaceae. Porella japonica – новый вид для флоры печеночников России, его новое местонахождение – самое северное в мире. Porella cordaeana – впервые выявлен для Дальнего Востока России. Результаты молекулярно-генетического анализа свидетельствуют, что собранные нами образцы P. cordaeana генетически более близки к североамериканским популяциям этого вида, но не европейским. В настоящее время известное разнообразие Porellaceae на российском Дальнем Востоке составляет 13 видов, что значительно превышает разнообразие семейства на остальной территории России. В статье приводятся морфологические описания двух видов, сделанные на основе дальневосточного материала, штриховые рисунки и фотографии прижизненного облика растений и их частей. Keywords: Hepaticae, liverworts, new records, Commander Islands, East Asia, southern Sikhote-Alin, the Russian Far East, печеночники, новые находки, Командорские острова, восточная Азия, южный Сихотэ-Алинь, Дальний Восток References Bakalin, V.A. 2018. Bryophyte Flora of North America, Provisional Publication. Porellaceae Cavers. Available from: https://www.mobot.org/plantscience/BFNA/V3/Porellaceae.htm. Last accessed 10.07.2025. Bakalin, V.A. & K.G. Klimova 2019. Porellaceae (Hepaticae) in the Russian Far East. Botanica Pacifica 8(1):105-131. CrossRef Beck, H.E., T.R. McVicar, N. Vergopolan, A. Berg, N.J. Lutsko, A. Dufour, Z. Zeng, X. Jiang, A.I.J.M. van Dijk & D.G. Miralles 2023. High-resolution (1 km) Köppen-Geiger maps for 1901-2099 based on constrained CMIP6 projections. Scientific Data 10:724. 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