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ABSTRACT
This paper reviews the status of all known species currently assigned to the genus Helicosporium. The generic concept is modified to include species with hyaline conidia whose filaments do not exceed 3 μm diam. Sixteen species are recognized. Helicosporium murinum and H. talbotii are proposed as nomen novo to replace H. griseum Bonorden and H. ramosum Talbot, which are homonyms of previously named species. Helicosporium lumbricoides is considered a synonym of H. griseum. Revised descriptions and a key to the species are given. Species resembling Helicosporium but having fuscous to dark conidia with filaments exceeding 5 μm in width have been assigned to the genus Drepanospora, as D. pannosa and D. viride. These are described and illustrated. Thirty-six names of doubtful or excluded species are treated.