Classification of the Klebsiella-Aerobacter group with special reference to the cold-tolerant Mesophilic Aerobacter types

Aërobacter liquefaciens Grimes and Hennerty 1931 is a later illegitimate homonym of A. liqu efaciens Beijerinck 1900. A. lipolyticus nom. nov. is proposed in its place. A detailed description is given. A. lipolyticus is widely distributed in nature and is important in dairy science. It usually fails to produce gas from lactose at 37°C, but produces it abundantly at 20–30°C. A. aërogenes with which it may be confused, produces gas from lactose at 37°C. A. lipolyticus differs from A. hibernicus by liquefaction of gelatin.