A NEW VARIETY OF STREPTOVERTICILLIUM
Ye Qingquan Institute of Materia Medica, Academia Sinica, Shanghai
Leucomycin producing strain Strepto-myces X-7 was isolated from a soil sampleof Chongming in Shanghai. It is differentfrom Streptomyces kitasatoensis Hata etal. in carbon source utilization and withoutspirals on glycerine starch glutamate agaretc. According to the suggestion of Baldacciin 1959, Streptomyces X-7 is named as Stre-ptoverticillium kitasatoensis var. chong-mingense n. var. The major componentX-7-III is active against gram positive bac-teria and penicillin or erythromycin resis-tant Staphylococcus aureus strains, but in-active against gram negative bacteria andfungi in vitro.