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'''Brettanomyces''', also referred to by brewers as "Brett" or "Bretta", is Greek for "British Fungus" and is a yeast that was originally thought of as an important yeast for producing the character of some 17th century and prior English ales. Since the wide adoption of pure cultures of ''Saccharomyces cerevisiae'' and ''S. pastorianus'' in the brewing and wine industries starting in the late 1800's, ''Brettanomyces'' has been mostly viewed as a spoilage yeast, except in Belgian lambic, Flanders red/brown beers, and a handful of styles of wine. More recently ''Brettanomyces'' has gained popularity in the United States (and subsequently the brewing industries of other countries) as a yeast that can contribute desirable and novel characteristics to beer and other alcoholic beverages. The genus name ''Dekkera'' is used interchangeably with ''Brettanomyces'', as it describes the teleomorph or spore-forming form of the yeast, although this form is extremely rare or perhaps even non-existent <ref>[http://en.wikipedia.org/wiki/Brettanomyces Wikipedia. Brettanomyces. Retrieved 2/24/2015.]</ref><ref name="Avramova_2018">[https://www.nature.com/articles/s41598-018-22580-7 Brettanomyces bruxellensis population survey reveals a diploid-triploid complex structured according to substrate of isolation and geographical distribution. Marta Avramova, Alice Cibrario, Emilien Peltier, Monika Coton, Emmanuel Coton, Joseph Schacherer, Giuseppe Spano, Vittorio Capozzi, Giuseppe Blaiotta, Franck Salin, Marguerite Dols-Lafargue, Paul Grbin, Chris Curtin, Warren Albertin & Isabelle Masneuf-Pomarede. 2018. doi:10.1038/s41598-018-22580-7.]</ref>. Known for its barnyard, fecal, horsey, metallic or Band-Aid flavors, ''Brettanomyces'' continues to be unwelcome in many breweries and most wineries<ref>[https://www.cambridge.org/core/journals/journal-of-wine-economics/article/brettanomics-i-the-cost-of-brettanomyces-in-california-wine-production/295D206007B358EC1B07CEF4879BE06B Brettanomics I: The Cost of Brettanomyces in California Wine Production. Julian M. Alston, Torey Arvik, Jarrett Hart and James T. Lapsley. 2020. DOI: https://doi.org/10.1017/jwe.2020.20.]</ref>. However, ''Brettanomyces'' also produces high levels of fruity esters that are desirable in some styles like saison, [[lambic]], and American sour beers. ''Brettanomyces'' can also form a [[pellicle]] during fermentation. See ''[[Lactobacillus]]'', ''[[Pediococcus]]'', ''[[Saccharomyces]]'', [[Mixed Cultures]], [[Kveik#Commercial_Availability|Kveik]], and [[Nonconventional Yeasts and Bacteria]] charts for other commercially available cultures.