The paper reports first records of new for Ukraine genus and species of fungicolous fungi, Immotthia atrograna (Cooke et Ellis) M.E. Barr. All collections were made in old-growth forests within protected areas in the Ukrainian Carpathians during recent mycological surveys. The fungus was found to be associated with two xylariaceous species, Annulohypoxylon cohaerens (Pers.) Y.M. Ju, J.D. Rogers et H.M. Hsieh and A. multiforme (Fr.) Y.M. Ju, J.D. Rogers et H.M. Hsieh. Diagnostic description, nomenclature data, geographical distribution and original illustrations for both sexual and asexual morphs of the reported species are provided. Morphologically similar fungicolous fungi are briefly reviewed and compared.
