Ascomycete species diversity was investigated on Carpinus betulus, which occurs in Lithuania at the north-eastern extreme of its distribution range. 75 species belonging to 54 genera and 13 orders are listed. Fifteen species are reported as new for Lithuania. Teleomorph and anamorph occurrences, host preference and distribution frequency are briefly discussed.
Keywords: Ascomycota, species diversity, checklist, European hornbeam.