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The Taphrinomycotina are one of three subdivisions constituting the Ascomycota (fungi that form their in a sac-like ascus) and is more or less synonymous with the slightly older invalid name Archiascomycetes (sometimes spelled Archaeascomycetes; archea = ancient). Recent molecular studies suggest that the group is monophyletic and basal to the rest of the Ascomycota.
The major taxa are Schizosaccharomycetes, Taphrinomycetes, Neolectomycetes, and Pneumocystis.
The Schizosaccharomycetes are the (e.g. Schizosaccharomyces) that reproduce by fission rather than budding, unlike most other yeasts, many of which are in the subdivision Saccharomycotina.
The Taphrinomycetes are dimorphic plant parasites (e.g. Taphrina) with both a yeast state and a filamentous (hyphae) state in infected plants. They characteristically infect leaves, catkins, and branches, not roots. Taphrinomycetes form ascus but no ascomata.
The Neolectomycetes are species in a single genus, Neolecta, which are the only members of the subdivision that form ascomata (fruiting bodies), and which specifically grow out of root tips. They may have a yeast state (ascospores bud in the asci).
The Pneumocystis also encompasses only one genus of yeasts, Pneumocystis, one of which causes Pneumocystis pneumonia in humans by developing cysts on the lung tissue.
None has ascogenous hyphae giving rise to the asci.
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