Abstract
In order to integrate ustilaginomycetous anamorphs into the general phylogenetic system of Ustilaginomycetes, partial nuclear large subunit ribosomal DNA sequences of 56 teleomorphic and 19 anamorphic species of the Ustilaginomycetes were analysed. Maximum parsimony and neighbour joining confirm the new suprageneric system of Ustilaginomycetes and indicate that (i) the species of Pseudozyma represent anamorphs of Ustilaginales parasitizing grasses, (ii) Pseudozyma prolifica, the type of Pseudozyma, is very closely related to Ustilago maydis, (iii) Pseudozyma tsukubaensis is probably synonymous with Ustilago spermophora, (iv) the species of Malassezia represent a group of its own within the Exobasidiomycetidae, (v) Tilletiopsis cremea, T. lilacina and T. washingtonensis belong to the Entylomatales and (vi) T. flava, T. fulvescens and T. minor are members of the Georgefischeriales. Like all Tilletiopsis species tested, T. albescens and T. pallescens are members of the Exobasidiomycetidae, but they cannot be ascribed to any of the known orders of this subclass. The description of the Malasseziales is emended.
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