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==Classification==
Yeast may belong to one of two phyla: Basidomycota or Ascomycota. ''Saccharomyces'', ''Brettanomyces'', and most of the wild yeasts relevant to brewers and wine makers belong to the phylum Ascomycota, with a few exception. When the specific name of a yeast is given (e.g. ''Saccharomyces cerevisiae'') the first word is the name of the Genus to which the yeast belongs, and the seconds word is the yeast's specific epithet. The genus name is often abbreviated after it has been made clear (e.g. ''S. cerevisiae''). The rules governing yeast taxonomy and nomenclature are laid down by the most boring group of people in the world, who operate under the alias "International Botanical Congress". Some commercial yeast strains are marketed under names which appear to be species names, but are not actually recognized (e.g. ''B. lambicus'' marketed by White Labs; actually a strain of ''B. bruxellensis''). ===Teleomorphs and Anamorphs===Some yeasts have sexual and asexual forms, which are morphologically and metabolically different but genetically the same. Each form has a different name. Often the genus name changes and the specific epithet does not (e.g. ''Brettanomyces bruxellensis'' and ''Dekkera bruxellensis''). '''Anamorphs''' are the asexual form, which reproduce clonally. '''Teleomorphs''' are the sexual form. ''Saccharomyces'' yeasts have no Teleomorphic genus, although they do sporulate to reproduce sexually. ''Brettanomyces'' yeasts are always belong to the genus ''Dekkera'' in the Teleomorphic form, while ''Candida'' teleomorphs belong to many different genera. ===Hybrids===When defined species hybridize the resultant yeast should technically be called by the name of both species with a "x" between. A cross between ''Saccharomyces cerevisiae'' and ''Saccharomyces eubayanus'' would be written "''Saccharomyces cerevisiae'' x ''Saccharomyces eubayanus''". In Progress)reality hybrids may be more complex than a single cross. Lager yeast is believed to have ''S. eubayanus'' and ''S. cerevisiae'' in its parentage, and it is often known by the name ''S. pasteurianus'', although it may not constitute a true species.
==Use in beer production==
(In Progress)