What is the scientific name for lager yeast?

The scientific name for lager yeast is Saccharomyces pastorianus. This yeast strain is specifically known for its role in brewing lagers, which are fermented at cooler temperatures compared to ales. Lager yeast is a bottom-fermenting yeast, meaning it ferments at lower temperatures and settles at the bottom of the fermentation vessel.

Saccharomyces pastorianus is a hybrid yeast, derived from the cross between two different yeasts: Saccharomyces cerevisiae and Saccharomyces bayanus. This allows it to thrive in lager fermentation conditions, which typically require cooler temperatures around 45-55°F (7-13°C), as opposed to the warmer fermentation temperatures utilized for ales.

Understanding the role and characteristics of Saccharomyces pastorianus is crucial for brewers aiming to achieve the clean, crisp flavors typical of lager beers. This yeast's ability to enhance certain flavor profiles while reducing fruity esters is what makes it particularly well-suited for this type of beer.