During the revision of the lichen genus Protopannaria in the Russian Far East an epiphyte lichen species new to Russia is reported. Protopannaria corticola previously known only from Sichuan Province of China (Himalayas) was found in montane coniferous and riparian deciduous forests on bark of conifer and deciduous trees in the northern and middle Sakhalin and the north-eastern Sikhote-Alin Mountain Range in the Khabarovsk Territory. The record of the species in the Russian Far East shows a rather major disjunction (ca. 4600 km) of the species area. Detailed original descriptions and distinctive features with illustrations for two representatives of the genus – Protopannaria corticola и P. pezizoides – are presented. One specimen of Fuscopannaria poeltii reported for Sakhalin earlier was reidentified as Protopannaria corticola, so the species was excluded from the lichen species list of Sakhalin and Russia. Keywords: biogeography, boreal zone, cool-temperate distribution, corticolous lichens, disjunctions, Far East of Russia, rare species.