Toward a Natural Classification of : A Study of the Type Specimens of .

The genus includes more than 200 epithets, but only the type species, and a dozen or more other species have been identified based on DNA sequence data. The taxonomic status of the other species remains unconfirmed because they lack either morphological information or DNA sequence data. In this study, types or authentic specimens of 16 "" species are reassessed to clarify their identity and phylogenetic position. DNA sequences of four regions, ITS, LSU, and , are analyzed and considered in combination with morphological characteristics. Based on the multigene phylogeny and morphological characters, and are transferred to . The generic status of and is confirmed in . var. and . var. are treated synonyms of . is transferred to as , and to as . is reduced to synonymy with . , , , and are tentatively kept in until further phylogenetic analysis is carried out on verified specimens. The ordinal status of , , and cannot be determined, and tentatively accommodate these species in . The study demonstrates the significance of a polyphasic approach in characterizing type specimens, including the importance of using of DNA sequence data.