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The moss flora of the Magura National Park in the Beskid Niski Range (Western Carpathians). Fragmenta Floristica et Geobotanica Polonica 7: 229–263. Kraków. ISSN 1640–629X. ABSTRACT: As a result of the bryological investigations carried out in 1997–1999 in the Magura National Park in the Beskid Niski Range (Western Carpathians, SE Poland), 171 species and three varieties of moss have been discovered. Of these, 22 species are new to the Beskid Niski Range. The moss flora of this area now totals 188 species and four varieties: the additional 17 species are literature reports and were not rediscovered during the course of the present studies. Of these, 84 taxa are locally very rare and most of them are rare and threatened in Poland, for example Brachydontium trichodes (Web.) Milde, Campylostelium saxicola (Web. & Mohr) B., S. & G., Ephemerum serratum (Hedw.) Hampe, Hygroamblystegium fluviatile (Hedw.) Loeske, Hypnum pratense (Rabenh.) Hartm., Neckera besseri (Łob.) Jur., Syntrichia virescens (De Not.) Ochyra and Tomentypnum nitens (Hedw.) Loeske. The moss flora of the study area is briefly assessed and the montane and oceanic species are characterized in detail, these consisting of 42 and 17 species (24.1 and 9.8% of the total flora), respectively. Additionally, ecological moss groups including epigean, saxicolous, epiphytic, epixylic, paludicolous and torrenticolous taxa are characterized. Eight areas of special bryological interest have been shown. An annotated list of species is presented.