Nucleotide sequence analyses of the hymenomycetous yeasts demonstrated that Hyalodendron lignicola should be considered as a member of the genus Trichosporon within the Trichosporonales and that Trichosporon pullulans is associated closely with the Cystofilobasidiales, rather than the Trichosporonales. Accordingly, the following proposals are made: Trichosporon lignicola comb. nov. and Guehomyces gen. nov., to accommodate Guehomyces pullulans comb. nov. in the Cystofilobasidiales.