Members of the genus (les) are filamentous fungi, which are found on nearly all substrates, but more frequently in soil. Till date, 7 species of have been reported in Korea, but being a ubiquitous group with high species diversity in temperate zones, this number is still low. During a survey of fungal biodiversity in Korea, we collected many isolates of , and through morphological and molecular phylogenetic analyses, identified them to be 3 previously unrecorded species, namely, , M. epicladia, and . A total of 10 species in Korea, including the 3 species reported in the present study, are widely distributed in 5 out of 7 phylogenetic groups of this genus. This indicates that the diversity of was so far underestimated in Korea. Multi-locus sequence analysis is required to provide a more reliable backbone for some uncertain phylogenetic groupings and to more clearly define a species of , which would encourage deeper research in the diversity and ecological roles of and allied genera.