Taxonomy and phylogeny of the basidiomycetous hyphomycete genus .

The taxonomy of the genus , typified by which based on circumstantial evidence was long assumed to be the hyphomycetous asexual morph of (, ) or occasionally (, ) is revised. Phylogenies based on the three nuc rDNA markers [internal transcribed spacers (ITS), 28S large ribosomal subunit nrDNA (28S) and 18S small ribosomal subunit nrDNA (18S)], based on cultures from Canada and the United States, suggest that the genus is synonymous with (, ) rather than or Morphological studies of 38 fungarium specimens of , including the type specimens of , , and and examination of the protologues of , and suggest that and are conspecific with while the remaining species are unlikely to be related to . The conidial chains produced by are similar to monilioid cells of asexual morphs of species formerly referred to the genus . The new combination is proposed and the species is redescribed, illustrated and compared with similar fungi. The ecological niche of and its possible relationship to orchid root endophytes is discussed. A key to asexual genera with similar conidium ontogeny to is provided. Mack J, Assabgui RA, Seifert KA (2021). Taxonomy and phylogeny of the basidiomycetous hyphomycete genus . 177-196. doi: 10.3114/fuse.2021.07.09.