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In the keys 78 genera of yeasts, yeast-like fungi and colourless algae are included. The yeasts with "asci" are classified in the order Endomycetales with the families Endomycetaceae, Ascoideaceae, Saccharomycodaceae, Saccharomycetaceae, Metschnikowiaceae and Schizosaccharomycetaceae. The yeasts related to the Ustilaginales (Ustomycota) and the Basidiomycetes with "ballistospores", teliospores (ustulospores) or basidium-like structures are arranged in the Sporobolomycetales with the families Sporobolomycetaceae and Filobasidiaceae.
The imperfect yeasts comprising asexual states of Endomycetales and Sporobolomycetales are enumerated in the Torulopsidales. The genera are listed with references to the literature, synonyms and type species. The number of species recognized in The Yeasts (Lodder, 1970) is mentioned and any new species or other changes since published are listed.
