Saccharomyces bayanus

Saccharomyces bayanus is a yeast of the genus Saccharomyces, and is used in winemaking and cider fermentation. It is closely related to Saccharomyces cerevisiae. Both Saccharomyces bayanus and Saccharomyces pastorianus contain diverse strains, with different genetic and metabolic characteristics, that may have a hybrid origin. In their current classification, both S. bayanus and S. pastorianus may be more correctly regarded as species complexes.