Extensive explorations for lichens have been made in semi-natural vegetation, outcrops of exposed rocks, and secondary forests of Mt. Sorak in Korea in 1995 and 1996. As a result, 32 families, 80 genera, 237 species, 1 subspecies, 1 variety and 1 form (240 taxa) are reported, of which 86 species are new to Korea and Staurolemma omphalarioides is new to Asia. Pertusaria pseudamara Moon et Shibuichi is newly described. Myelochroa coreana Y. S. Park is reduced to synonym of M. aurulenta (Tuck.) Elix & Hale. Even though more field surveys and more detailed taxonomic studies are required before a detailed analysis of the lichen flora of Korea can be made, phytogeographical features are outlined in the present paper.