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'''Lactobacillus''' (often referred to as ''Lacto'') is a genus of lactic acid bacteria (LAB) which produces acidity and sour flavors in the form of lactic acid (and sometimes acetic acid) found in lambics, Berliner Weiss, sour brown ales, and gueuze. All ''Lactobacillus'' species are facultative anaerobes, which means the can grow in the presence of oxygen and switch between anaerobic and aerobic metablism <ref>[http://textbookofbacteriology.net/lactics_4.html ''Lactic Acid Bacteria''. Todar's Online Texbook of Bacteriology. Kenneth Todar, PhD. Retrieved 07/28/2015.]</ref><ref>[http://textbookofbacteriology.net/nutgro_4.html ''Nutrition and Growth of Bacteria''. Todar's Online Texbook of Bacteriology. Kenneth Todar, PhD. Retrieved 07/28/2015.]</ref>. ''Lacto'' can form a [[pellicle]] (need reference). See [[Pediococcus]], [[Brettanomyces]], [[Saccharomyces]], and [[Mixed Cultures]] charts for other commercially available cultures. See the [[Sour Worting]] and [[Mixed Fermentation]] pages for brewing techniques with ''Lactobacillus''. See the [[Alternative Bacteria Sources]] section for culturing ''Lactobacillus'' from grains, yogurt, probiotics, and other sources.