Based on phylogenetic as well as phenotypic characters, Zasmidium proved to be the oldest genus name for Stenella-like anamorphs belonging to the Mycosphaerellaceae. Stenella s. str. with S. araguata as type species is phylogenetically part of the Teratosphaeriaceae. Furthermore, the two genera are also morphologically somewhat distinct by differences in the structure of the conidiogenous loci, being planate in Zasmidium, and more pileate in Stenella. Due to the new generic nomenclature and taxonomy within this complex of hyphomycetes, some new reallocations of former Stenella species to Zasmidium are necessary.