More than 6,600 species of fungi (including lichen-forming species) have been recorded from Ukraine, but this number is far from complete. The true total number of fungal species occurring in Ukraine, including species not yet recorded, is likely to be far higher, given the generally accepted estimate that only about 7% of all fungi worldwide have so far been discovered. Although the amount of available information is still very small, a first effort has been made to estimate the number of fungal species endemic to Ukraine, and 2,217 such species have been tentatively identified.