The first regional list of threatened lichens in the Polish East Sudetes is presented. The list is a result of investigation studied in the Śnieżnik Massif and the Bialskie Mountains. The status of listed lichen species has been evaluated according to the Red List Categories by IUCN (2001, version 3.1). The data obtained were compared with historical ones. Changes of the species main frequency were used as an additional indicator of their threat status. The Red List includes 227 taxa of lichens, which constitute 50% of the local biota and 14% of Polish biota. The status of threatened biota has the following categories: Regionally Extinct (RE) 78 taxa, Critically Endangered (CR) 12, Endangered (EN) 14, Vulnerable (VU) 8, Near Threatened (NT) 30, Least Concern (LC) 15 and Data Deficient (DD) 70. The most threatened are epiphytes typical of deciduous forests.
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