102 ACTINOMYCETES 



Antagonistic properties: None; certain strains give postive activity. 



Remarks: Not Streptomyces viridis of Baldacci, or of Millard and Burr 

 (now Streptomyces viridogenes) , or of Duche. According to Krassilnikov, 

 Streptomyces lipmanii and Streptomyces verne represent strains of this spe- 

 cies ; Streptomyces viridis sterilis also listed as a strain that lost the capacity 

 to produce aerial mycelium. 



111. Streptomyces thermophilus (Gilbert) Waksman and Henrici. 

 (Gilbert, Z. Hyg, 47, 1904, 383.) 



Aerial mycelium: Hyphae straight, conidia formed. 



Nutrient agar: No pigment. 



Potato: Growth yellowish; no aerial mycelium. Plug usually colored 

 brown. 



Gelatin: Liquefaction. No pigment. 



Milk: Proteolysis. 



Starch: Growth yellowish; aerial mycelium white-gray. Hydrolysis good. 



Czapek's agar: At 28°C growth deep, colorless; aerial mycelium thin, 

 white; no soluble pigment. 



Temperature: Optimum 50°C. Good growth at 28°C. Usually no growth 

 at 60°C. Some strains are incapable of growing at 28°C, whereas others 

 seem to grow well even at 65°C. 



Remarks: The culture Streptomyces thermophilus Berestnev is different. 

 It produces spiral-shaped sporophores and spherical conidia. Growth is 

 yellow-brown with brown soluble pigment. Aerial mycelium is velvety, dark 

 green to gray-green. According to Noack's description, S. thermophilus pro- 

 duces a soluble bright red pigment. 



112. Streptomyces thermodiastaticus (Bergey) comb. nov. (Bergey, 

 D. H., J. Bacteriol. 4, 1919, 301.) 



Aerial mycelium: Well-developed, white. Sporophores produce spirals; 

 spores spherical to oval. 

 Synthetic agar: Growth colorless. Aerial mycelium well-developed, white. 

 Potato: Growth brownish. Aerial mycelium light gray. 

 Gelatin: Liquefaction slow. 

 Milk: No coagulation; no peptonization. 

 Starch: Hydrolysis strong. 

 Cellulose: Growth good. 

 Nitrate: Reduction. 

 Sucrose: Inversion. 

 Temperature: Optimum 65°C. 



