A total of 141 species of lichenicolous fungi, 12 lichenicolous lichens, and 94 biogeographically interesting non-lichenicolous lichens, mainly from the Russian Arctic, are reported and many are discussed. Corticifraga fusispora sp. nov. (on Peltigera), Odontotrema japewiae sp. nov. (on Japewia), and Opegrapha pulvinata var. placidiicola var. nov. (on Placidium) are described from Russia. Dactylospora rinodinicola is reduced to synonymy with D. deminuta. New to North America: Didymellopsis latitans, Epilichen glauconigellus, Polycoccum bryonthae, Psora elenkinii, Stigmidium solorinarium, and Unguiculariopsis refractiva. New to Asia and Russia: Adelococcus alpestris, Arrhenia peltigerina, Arthrorhaphis olivacea, Buellia lecanoricola, Epibryon solorinae, Hobsoniopsis santessonii, Lecidea polytrichinella, Lichenochora coppinsii, L. elegantis, Muellerella atricola, Odontotrema cuculare, Opegrapha geographicola, Phaeoseptoria peltigerae, Phoma denigricans, P. physciicola, Polydesmia lichenis, Pronectria walkerorum, Rhagadostoma brevisporum, Roselliniella pannariae, Sclerococcum montagnei, Scutula dedicata, Tremella christiansenii, Trichosphaeria lichenum, Unguiculariopsis thallophila, Weddellomyces protearius, Zwackhiomyces immersae, and Z. physciicola. New to Asia, but not Russia: Capronia peltigerae, Dacampia rufescentis, Lasiosphaeriopsis salisburyi, Lichenochora weillii, Pronectria minuta, P. tibellii, Reconditella physconiarum, Skyttea tephromelarum, Stigmidium mitchellii, and Xenonectriella ornamentata. New to Russia, but not Asia: Chaenothecopsis parasitaster, Polycoccum crassum, Rhymbocarpus geographici, Stigmidium psorae, S. squamariae, Vouauxiomyces santessonii, and Zwackhiomyces coepulonus. New to Kyrgyzstan: Stigmidium solorinarium. New to Mongolia: Cercidospora verrucosaria. New to the Arctic: Aspicilia transbaicalica, Dactylospora homoclinella, Didymellopsis latitans, Epibryon solorinae, Hobsoniopsis santessonii, Lasiosphaeriopsis salisburyi, Lecanora baicalensis, Lichenochora coppinsii, L. elegantis, Lichenoconium xanthoriae, Lichenostigma elongatum, Lobaria epovae, Muellerella atricola, Opegrapha geographicola, O. pulvinata, Phaeoseptoria peltigerae, Phoma denigricans, P. peltigerae, P. physciicola, Polycoccum crassum, Polydesmia lichenis, Psora elenkinii, Reconditella physconiarum, Rhymbocarpus geographici, Roselliniella pannariae, Sclerococcum montagnei, Scutula dedicata, S. epiblastematica, Skyttea tephromelarum, Stigmidium squamariae, Tremella christiansenii, Trichosphaeria lichenum, Unguiculariopsis thallophila, Weddellomyces protearius, Xenonectriella lutescens, Zwackhiomyces immersae, and Z. physciicola. New to the American Arctic: Arthonia glebosa, Caloplaca epithallina, Polycoccum bryonthae, Psorula rufonigra, Scutula tuberculosa, Stigmidium solorinarium, S. tabacinae, and Unguiculariopsis refractiva. New to Greenland: Taeniolella diederichiana. New to Svalbard: Graphium aphthosae, Llimoniella groenlandiae, and Polycoccum bryonthae. New to the Russian Arctic: Caloplaca tominii, Dactylospora homoclinella, Glypholecia scabra, Lecanora argentea, L. cavicola, Neolamya peltigerae, Phaeospora peltigericola, Polycoccum pulvinatum, Psora vallesiaca, Rhagadostoma brevisporum, Rimularia insularis, Squamarina lentigera, Stigmidium mitchellii, Tetramelas phaeophysciae, Xenonectriella ornamentata, and Zwackhiomyces coepulonus. Twenty species of lichenicolous fungi or lichens are reported on new host genera, and 35 species on new host species