lactobacillus gasseri lactobacillus gasseri lactobacillus gasseri is a species in the genus lactobacillus identified in 1980 by françois gasser and his associates. it is part of the vaginal flora. its genome has been sequenced. l. gasseri is a normal inhabitant of the lower reproductive tract in healthy women. it also produces lactocillin. lactobacillus gasseri scientific classification domain: bacteria phylum: bacillota class: bacilli order: lactobacillales family: lactobacillaceae genus: lactobacillus species: l. gasseri binomial name lactobacillus gasserilauer and kandler 1980 lactobacillus gasseri produces gassericin a, a bacteriocin.