68 ACTINOMYCETES 



Antagonistic properties: Produces antibiotic substances, one of which is 

 candicidin-like material. 



Source: Soil. 



Remarks: Several strains of this organism have been isolated. They differ 

 in the pigmentation of gelatin and in the relative abundance of aerial myce- 

 lium. 



49. Streptomyces globosus (Krassilnikov) comb. nov. (Krassilnikov, 

 N. A., Actinomycetales, Akad. Nauk. USSR, Moskau, 1941, 58.) 



Vegetative growth: Colonies dark brown producing soluble brown pig- 

 ment into medium. 



Aerial mycelium: Dark gray, fine velvety. Sporophores straight, short; 

 spores spherical. 



Gelatin: Liquefaction weak. 



Milk: Peptonization. 



Starch: Hydrolysis. 



Sucrose: No inversion. 



Antagonistic properties: No activity against mycobacteria. 



Source: Soil, food products, potatoes. 



50. Streptomyces cylindrosporus (Krassilnikov) comb. nov. (Krassil- 

 nikov, N. A., Actinomycetales, Akad. Nauk. USSR, Moskau, 1941, 57.) 



Vegetative growth: Cultures readily lose capacity to produce spores. 



Aerial mycelium: Well-developed, cottony or velvety, grayish white. 

 Sporophores straight, spores cylindrical, 1.0-1.7 by 0.7 pc. 



Synthetic agar: Colonies velvety, dark brown or chocolate, with white- 

 gray aerial mycelium. 



Nutrient agar: Growth dark brown, with white aerial mycelium. 



Gelatin: Liquefaction medium. 



Milk: Coagulation limited, peptonization weak, milk becoming brown to 

 almost black. 



Starch: Hydrolysis weak. 



Cellulose: No growth. 



Nitrate: Reduction strong to weak. 



Sucrose: No inversion. 



Antagonistic properties: None. 



51. Streptomyces viridochromogenes (Krainsky) Waksman and Hen- 

 rici. (Krainsky, A., Centrbl. Bakt. II, 41, 1914, 639-688.) 



Aerial mycelium: Hyphae with numerous open spirals, 3-5 ju in diameter, 

 occurring as side branches; spores short, oval or spherical, 1.25-1.5 ju. 



