Brettanomyces bruxellensis (the anamorph of Dekkera bruxellensis) is a yeast associated with and named after, the Senne valley near Brussels, Belgium. It is one of several members of the genus Brettanomyces, a genus first isolated in 1889 by Seyffert of the Kalinkin Brewery in St.Petersburg as a "Torula" from English beer which produced the typical "English" taste in lager beer. In 1899 JW Tullo at Guinness described two types of "secondary yeast" in Irish stout. However N. Hjelte Claussen at the Carlsberg brewery was the first to publish a description in 1904, following a 1903 patent (UK patent GB190328184) that was the first patented microorganism in history. The isolation of an organism derived from bottles of traditional English beer was described and therefore the name Brettanomyces w