Saccharomyces eubayanus

Saccharomyces eubayanus, a type of yeast, is a likely parent of the lager brewing yeast, Saccharomyces pastorianus.

Lager is a type of beer created from malted barley and fermented at low temperatures, originally in Bavaria. S. eubayanus was first discovered in Patagonia, possibly being an example of Columbian exchange.

With discoveries in other parts of the world shortly after, the South American origins of S. eubayanus have been challenged, in particular by genomic and phylogenetic evidence suggesting a Tibetan origin. The proponents of this theory argue that it "corresponds better with geography and world trade history."