SPECIES OF STREPTOMYCES 81 



Milk: Ring cream-colored. Coagulation and peptonization rapid, medium 

 becoming strongly alkaline. 



Starch: Growth golden yellow; aerial mycelium whitish. 



Cellulose: Growth on paper fair; cellulose decomposition. 



Nitrate: Reduction positive. 



Antagonistic properties: Produces a basic antibiotic, flavomycin, similar 

 to neomycin. 



Remarks: Culture similar to Streptomyces microflavus. 



73. Streptomyces putrificans (Nicolaeva) comb. nov. (Nicolaeva, E., 

 Arch. Biol. Nauk., 18, 1915, 229.) 



Vegetative growth: Colorless. 



Aerial mycelium: White. 



Nutrient agar: Growth grayish, covered with white aerial mycelium. No 

 soluble pigment. 



Potato: Growth folded, sulfur-yellow. Aerial mycelium chalk-white. No 

 soluble pigment. 



Milk: Pellicle heavy, covered with white aerial mycelium. Peptonization 

 gradual without previous coagulation. 



Glucose broth: Soluble pigment yellow. 



Loeffler's serum: Growth yellow. No aerial mycelium. Serum liquefied 

 and colored yellowish brown. 



Odor: Strong, putrefactive. 



Habitat: Spring water. 



Remarks: Decomposes proteins energetically, with the formation of bad 

 smelling products (H 2 S, NH 3 ). 



74. Streptomyces citreus (Krainsky) Waksman and Henrici. (Krain- 

 sky, A., Centrbl. Bakt. II, 41, 1914, 639-688.) 



Aerial mycelium: Filaments with long, narrow open spirals. Conidia 

 spherical to oval, 1.2-1.5 by 1.2-1.8 y.. 



Synthetic agar: Growth abundant, spreading, raised, wrinkled, citron- 

 yellow. Aerial mycelium covering surface, citron-yellow. 



Nutrient agar: Growth restricted, cream-colored. 



Glucose agar: Entire growth extensive, glossy, olive-yellow; center ele- 

 vated. 



Potato: Growth yellowish; aerial mycelium white. 



Gelatin: Surface growth restricted, yellowish. Liquefaction in 35 days. 



Milk: Surface growth cream-colored. Coagulation; peptonization, be- 

 coming alkaline. 



