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Other factors can determine if a ''facultative heterofermentative'' species uses ''homolactic'' or ''heterolactic'' fermentation. For example, L. plantarum, which is a ''facultative facultatively heterofermentative'' species, is ''homolactic'' without the presence of oxygen. In the presence of oxygen, however, it performs ''heterolactic'' fermentation, and produces acetic acid <ref>[https://microbewiki.kenyon.edu/index.php/Lactobacillus_plantarum_and_its_biological_implications Lactobacillus plantarum and its biological implications. Microbe Wiki. Retrieved 6/7/2015.]</ref><ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1083842231643990/?comment_id=1084922688202611&offset=0&total_comments=28&comment_tracking=%7B%22tn%22%3A%22R%22%7D Conversation with Lance Shaner about L. plantarum on MTF. 6/7/2015.]</ref>.

It is worth noting that the amount of CO2 produced is very small in ''heterofermentative'' species. Lance Shaner of Omega Yeast Labs noted that although L. brevis is classified as ''heterofermentative'', the human eye cannot detect any CO2 production in the Omega Yeast Lactobacillus blend (OYL-605). Lance still needs to test this blend to see if it does produce any CO2. It is clear though that a any type of Lactobacillus, regardless of whether it is ''heterofermentative'' bacteria or ''homofermentative'', cannot produce a krausen, which is . Krausens are often seen with the use of other commercially available Lactobacillus cultures. If a krausen develops in wort when it is the only a Lactobacillus culture that is pitched and no Saccharomyces is pitched, this is indicative of cross contamination of Saccharomyces or Brettanomyces in the wort or even the Lactobacillus culture itself <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1083842231643990/?comment_id=1084646124896934&offset=0&total_comments=26&comment_tracking=%7B%22tn%22%3A%22R8%22%7D Discussion with Lance Shaner on MTF. 6/7/2015.]</ref>.