Specimens tentatively identified as Plectocarpon lichenum growing on previoulsy unreported host species (Lobaria orientalis, L. spathulata, and L. tuberculata) are described and their atypical morphology is discussed. Based on new abundant material, the concept of P. triebeliae, here newly reported from Asia and Russia, and newly reported on Lobaria species, is refined. Well-developed, conspicuous vegetative hyphae, as well as a presumable synanamorph are noted for the first time for Verrucoccum coppinsii agg., a species that is here newly reported for Asia and Russia. Comparison of some diagnostic characters of Sclerococcum species growing on Lobariaceae hosts is provided. Asian specimens of Sclerococcum growing on Ricasolia are well distinguished from S. ricasoliae by a thicker basal exciple and larger ascospores. Stigmidium lobariae is newly reported from Russia. Abrothallus lobariae, Merismatium lobariae, Sclerococcum lobariellum s. lat., and Tremella lobariacearum s. lat. are newly reported from the Sakhalin Region of Russia. Lobaria orientalis is reported as a new host species for Merismatium lobariae and Stigmidium lobariae. Lobaria meridionalis and L. tuberculata are reported as new host species for Abrothallus lobariae. Lobaria tuberculata and Ricasolia japonica are reported as new host species for Sclerococcum lobariellum s. lat. Keywords. – Biogeography, lichen parasites, Kuril Islands, Lobariaceae, Russian Far East, Sakhalin Island, taxonomy.