''Saccharomyces uvarum'' is a species of

yeast Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. The first yeast originated hundreds of millions of years ago, and at least 1,500 species are currently recognized. They are estimated to constitut ...

that is commonly found in fermented beverages, particularly those fermented at colder temperatures. It was originally described by

Martinus Willem Beijerinck Martinus Willem Beijerinck (, 16 March 1851 – 1 January 1931) was a Dutch microbiologist and botanist who was one of the founders of virology and environmental microbiology. He is credited with the discovery of viruses, which he called " ...

in 1898, but was long considered identical to '' S. bayanus''. In 2000 and 2005, genetic investigations of various ''Saccharomyces'' species indicated that ''S. uvarum'' is genetically distinct from ''S. bayanus'' and should be considered a unique species. It is a bottom-fermenting yeast, so-called because it does not form the foam on top of the

wort Wort () is the liquid extracted from the mashing process during the brewing of beer or whisky. Wort contains the sugars, the most important being maltose and maltotriose, that will be fermented by the brewing yeast to produce alcohol. Wort ...

that

top-fermenting yeast Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. The first yeast originated hundreds of millions of years ago, and at least 1,500 species are currently recognized. They are estimated to constitut ...

does.

References

uvarum Yeasts Yeasts used in brewing {{yeast-stub