42 ACTINOMYCETES 



photometric curve almost identical with that of azolitmin. There are un- 

 doubtedly other pigments produced, especially by different other strains 

 believed to be typical of Actinomyces violaceus ruber, a culture described by 

 Waksman and Curtis. 



7. Streptomyces pluricolor (Berestnev emend. Krassilnikov) comb, 

 nov. (Krassilnikov, N. A., Actinomycetales, Akad. Nauk. USSR, Moskau, 

 1941, 17.) 



Aerial mycelium: Well-developed, white-gray. Sporophores produce nu- 

 merous spirals, with 3-5 turns (sinistrorse). Spores oval, 0.9 by 0.7 ju. 



Synthetic agar: Growth at first pigmented red-yellow, then changing to 

 blue or blue-green. The blue pigment dissolves into medium. 



Potato: Growth and soluble pigment sharp blue. 



Gelatin: Liquefaction rapid. 



Milk: Peptonization without coagulation. 



Starch: Hydrolysis. 



Cellulose: No growth. 



Nutrient broth: Green fluorescent pigment produced. 



Sucrose: Inversion. 



Antagonistic properties: None. 



8. Streptomyces cyaneus (Krassilnikov) comb. nov. (Krassilnikov, N. 

 A., Actinomycetales, Akad. Nauk. USSR, Moskau, 1941, 14.) 



Vegetative growth : Pigmented blue, the pigment dissolving into medium, 

 remaining blue at both acid and alkaline reactions. 



Aerial mycelium: Sporophores produce open spirals (sinistrorse), with 

 2-3 turns in each. Spores oval, seldom spherical, 0.6-0.8 by 0.6 ju. 



Synthetic agar: Colonies at first smooth, becoming lumpy, leathery- 

 compact, and covered with well-developed blue-gray aerial mycelium. 



Gelatin: Liquefaction rapid, completed in 5-6 days. 



Milk: Peptonization with prior coagulation. 



Starch: Hydrolysis weak. 



Cellulose: No growth. 



Nitrate: No reduction. 



Sucrose: No inversion. 



Antagonistic properties: Weak. 



9. Streptomyces vinaceus Mayer et al. (Mayer, R. L., Crane, C, 

 DeBoer, C. J., Konopka, E. A., Marsh, J. S., and Eisman, P. C, XHth 

 Intern. Congr. Pure Appl. Chem., 1951, 283-284.) 



Aerial mycelium: No spirals. Spores nearly spherical, 1.0-1.5 /*. 



