ECOLOGY OF THE LACTIC STREPTOCOCCI. A REVIEW1

Abstract
Early and recent literature on the nomenclature and sources of lactic streptococci in nature is reviewed. Evidence is presented in favor of including Streptococcus diacetilactis as a recognized species in the group N streptococci. Despite many research efforts, the natural habitat of Streptococcus cremoris remains unknown. An appeal for more ecological studies on these important bacteria is made.