102 species of lichenicolous fungi and 23 lichens are reported, mainly from the Russian Arctic. Four new taxa are described: Clypeococcum bisporum (on Cetraria and Flavocetraria), Echinodiscus kozhevnikovii (on Cetraria), Stigmidium hafellneri (on Flavocetraria) and Gypsoplaca macrophylla f. blastidiata. The following lichenicolous fungi are reported for the first time from North America: Monodictys fuliginosa, Stigmidium microcarpum and Trichosphaeria lichenum. The following lichenicolous fungi and lichens are reported as new to Asia: Arthonia almquistii, Arthophacopsis parmeliarum, Cercidospora lobothalliae, Clypeococcum placopsiphilum, Dactylospora cf. aeruginosa, D. frigida, Epicladonia sandstedei, Everniicola flexispora, Hypogymnia fistulosa, Lecanora luteovernalis, Lecanographa rinodinae, Lichenochora mediterraneae, Lichenopeltella peltigericola, Lichenopuccinia poeltii, Lichenosticta alcicornaria, Phoma cytospora, Polycoccum ventosicola, Roselliniopsis gelidaria, R. ventosa, Sclerococcum gelidarum, Scoliciosporum intrusum, Stigmidium croceae, S. mycobilimbiae, S. stygnospilum, S. superpositum, Taeniolella diederichiana, Thelocarpon impressellum and Zwackhiomyces macrosporus. Twenty-eight species are new to Russia, 15 new to the Arctic, five new to Mongolia and nine new to Alaska. Twenty lichen genera and 31 species are new hosts for various species of lichenicolous fungi.