Abstract
Nucleic acid and biochemical studies were performed on some lactobacilli from the human oral cavity which phenotypically resemble Lactobacillus brevis. The oral strains were distinct from L. brevis and other heterofermentative Lactobacillus species and warrant a new species, for which the name Lactobacillus oris sp. nov. is proposed. The type strain of Lactobacillus oris is NCDO 2160T.