Eight species of the genus Pertusaria in the family Pertusariaceae are reported from the Cheju Island in Korea. Among them four species are newly recorded for the Korean lichen flora. P. coreana Räsänen is reduced to a synonym of P. astomoides Nyl. The presence of pseudocyphellae is reported in P. laeviganda and P. sublaeviganda. An artificial key for all species of the genus known to occur in Korea is provided. Pertusaria, lichen, Korea, pseudocyphellae