76 ACTINOMYCETES 



Gelation: Liquefaction rapid. 



Milk: Coagulation and peptonization. 



Starch: Hydrolysis. 



Cellulose: No growth. 



Nitrate: Reduction rapid. 



Sucrose: Inversion. 



Antagonistic properties: Weak. 



Remarks : Streptomyces verticillatus viridans described as substrain. 



64. Streptomyces circulatus (Krassilnikov) comb. nov. (Krassilnikov, 

 N. A., Actinomycetales, Akad. Nauk. USSR, Moskau, 1941, 60.) 



Vetetative growth: Better on synthetic than on organic media. 

 Aerial mycelium: Spiral-producing sporophores formed in whorls. Spores 

 cylindrical, oblong, 1.5 by 0.7m, some rounding up with age of culture. 

 Synthetic agar: Growth good, producing abundant white aerial mycelium. 

 Nutrient agar: Growth weak; no aerial mycelium. 

 Gelatin: Liquefaction weak. 

 Milk: No coagulation; peptonization slow. 

 Starch: Hydrolysis weak. 

 Cellulose: No growth. 

 Nitrate: Reduction weak. 

 Sucrose: No inversion. 

 Antagonistic properties: Limited. 



65. Streptomyces rubrireticuli (Waksman) Waksman and Henrici. 

 (Waksman, S. A., Soil Sci., 8, 1919, 146.) 



Aerial mycelium: Branching filaments with both primary and secondary 

 whorl formation. Spirals formed on glucose agar. Conidia oval-shaped. 



Synthetic agar: Growth abundant, spreading, usually pink. Aerial myce- 

 lium thin, rose to pink. 



Nutrient agar: Growth red, with yellowish margin, becoming red. 



Glucose agar: Entire growth abundant, spreading, rose-red. 



Potato: Growth cream-colored, later pink to dark red. 



Gelatin: Surface growth yellowish red to dragon-pink. Liquefaction. 



Milk: Pellicle abundant, red; coagulation; peptonization. Reaction un- 

 changed. 



Starch: Growth white with red tinge. Hydrolysis positive. 



Cellulose: Good growth. 



Glucose broth: Sediment thin, flaky. 



Nitrate: Reduction to nitrite. 



