SUMMARYThe biochemical and physiological characters of 28 strains of motile lactobacilli isolated from silage, and of two motile strains of Lactobacillus salivarius, are described. The silage organisms belong to the homofermentative low-temperature group but their properties are different from those of L. casei and L. plantarum. Flagella-stained preparations and electron micrographs of two strains show that they have numerous peritrichous flagella.