What is the scientific name for lager yeast?

The scientific name for lager yeast is indeed Saccharomyces pastorianus. This yeast is a bottom-fermenting strain, which is primarily responsible for producing lager beers. It ferments at lower temperatures compared to ale yeasts, making it suitable for the cooler conditions often required for lager production. This yeast strain is known for its ability to produce clean and crisp flavors, which are characteristic of many lagers.

Understanding the other choices provides additional context. Saccharomyces cerevisiae is known as ale yeast and is used in the production of ales and other fermented beverages. Schizosaccharomyces pombe is a yeast used mainly in the fermentation of certain types of sake and is not typically employed in lager brewing. Brettanomyces bruxellensis is a wild yeast that contributes to the flavor profiles of some specialty and sour beers, but it is not used for traditional lager fermentation. Thus, Saccharomyces pastorianus is distinctly recognized for its role in lager beer fermentation.