[in Slovakian with English abstract: ] The primeval forest stands in the Bystrá dolina valley, located on the south-facing slopes of the Nízke Tatry Mountains, are valuable biotopes. In 20th century, valuable data on the occurrence of lichen species rare in Slovakia were collected here by Antonín Vězda, Ivan Pišút, Jiří Liška and others. The most notable finding is that of Lobaria amplissima, a suboceanic macrolichen requiring high air humidity. In this contribution, we present findings from two excursions conducted to verify the presence of rare epiphytic lichens, with a focus on species such as Lobaria amplissima, L. pulmonaria, Leptogium saturninum, Menegazzia terebrata, Parmeliella triptophylla, Ramonia luteola, Thelopsis flaveola and Thelotrema lepadinum. We present a list of 138 species reported from the studied area during the past and recent research. During our excursions, we recorded 65 of them. Absconditonia sublignicola is reported from Slovakia for the first time based on morphological characters. Of these, 9 are legally protected, 24 are critically endangered (CR), 8 are endangered (EN), 10 are vulnerable (VU), and 7 species fall into the category of LR:nt. We have not confirmed the occurrence of Lobaria amplissima. Of the rare epiphytic macrolichens – epiphytes we recorded five occurrences of Lobaria pulmonaria and one occurrence of Leptogium saturninum. Gyalecta herculina thrives well on bases and exposed roots of beech trees. The list of records includes also several epiphytes commonly present throughout the country. This study is the result of collaboration among researchers, nature conservation professionals, and citizen scientists. Keywords: citizen science, diversity, iNaturalist, the Western Carpathians.