Distoseptate, porogenous conidia distinguish Helminthosporium from Vakrabeeja, Pleurophragmium, and Sporidesmium with euseptate, blastogenous or murogenous conidia. Helminthosporium is provisionally maintained in a comprehensive sense for the subgenera Cylindro-Helminthosporium, Euhelminthosporium, and Helminthosporium. It should be redefined with H. maydis Nisik. & Miy. as the type and conserved for species in the subgenera Cylindro-Helminthosporium and Euhelminthosporium characterized by semiaxial or lateral conidial germ tubes, lateral conidiophore proliferations, and pseudopleurogenous conidia. Spondylocladium with S. atrovirens (Harz) Harz ex Sacc. as the type should be conserved for species in Spondylocladium auct. and the subgenus Helminthosporium with percurrent conidial germ tubes, acropleurogenous conidia, and infrequent percurrent conidiophore proliferations. Species with percurrent conidial germ tubes, acrogenous conidia, and variable conidiophore proliferations should be placed in Exosporium (syn. Corynespora).

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