leuconostoc citreum leuconostoc citreum leuconostoc citreum is a vancomycin-resistant, gram-positive, coccus-shaped bacterium, with type strain ncdo 1837. its genome has been sequenced. leuconostoc citreum scientific classification domain: bacteria phylum: bacillota class: bacilli order: lactobacillales family: lactobacillaceae genus: leuconostoc species: l. citreum binomial name leuconostoc citreumfarrow et al. 1989