Abstract
Summary: A preliminary examination of strains of leuconostocs collected from many different laboratories has resulted in a division into six groups. Some of these groups are heterogeneous. The nameLeuconostoc cremorisis used in preference toLeuconostoc citrovorumfor the non-sucrose fermenting species. Reasons are given. Other arguments lead to the conclusion thatStreptococcus kefir(Evans) should be regarded as a synonym ofLeuconostoc mesenteroides, and the nameLeuconostoc lactisis used in preference toStreptococcus kefir(Abd-el-Malek & Gibson).