Species diversity and distribution of teleomorphic and anamorphic ascomycetes have been investigated on various parts of Fraxinus excelsior in Lithuania. In total,100 species from 64 genera of the teleomorphic ascomycetes plus 10 taxa identified at the generic level and 103 species from 89 genera of the anamorphic fungi and 8 taxa identified at the generic level are listed in the present paper. 56 species are reported for the first time in Lithuania. Teleomorph-anamorph occurrence, substrate preference, distribution frequency and negative impact on ash trees are briefly discussed.
Keywords: fungi, checklist, species diversity, substrate preference, ash.