SPECIES OF STREPTOMYCES 117 



Cellulose: No growth. 

 Nitrate: Reduction to nitrite. 

 Antagonistic properties: Positive. 

 Habitat: Sweet potato disease. 



136. Streptomyces poolensis (Taubenhaus) Waksman and Henrici. 

 (Taubenhaus, J. J., J. Agr. Research, 13, 1918, 446.) 



Aerial mycelium: Fine, branching; spirals usually not seen. Conidia oval 

 to elliptical. 



Synthetic agar: Growth thin, spreading, colorless. Aerial mycelium white 

 to gray. 



Nutrient agar: Growth translucent, yellowish. 



Glucose agar: Growth abundant, glossy, raised center, entire, light brown. 



Potato: Growth thin, reddish brown; medium becoming purplish. 



Gelatin: Liquefaction, with small, brownish flakes in fluid. 



Milk: Ring brownish. Coagulation; peptonization, with strongly alkaline 

 reaction. 



Starch: Growth restricted, cream-colored. No hydrolysis. 



Glucose broth: Ring thin, brownish. 



Nitrate: Reduction to nitrite. 



Temperature: 37°C. 



Antagonistic properties: Positive. 



Habitat: Sweet potato "pox." 



Remarks: Faint trace of soluble brown pigment. 



137. Streptomyces tumuli (Millard and Beeley) comb. nov. (Millard, 

 W. A., and Beeley, F., Ann. Appl. Biol., U, 1927, 296-311.) 



Synthetic agar: Growth, penetrating into the medium, gray, later becom- 

 ing darkly opaque. Aerial myceliun arises on center of growth, at first 

 white, later becoming pale gray. Surface of growth covered with colorless 

 drops leaving small black craters. No soluble pigment. 



Nutrient agar: Growth good, lustrous, slimy, gray. No aerial mycelium. 

 No soluble pigment. 



Glucose agar: Growth wrinkled, pale gray. White aerial mycelium arising 

 in concentric rings around a dark bare center. Soluble pigment olive-colored. 



Potato: Growth heavy, slimy, black. No aerial mycelium. Plug becom- 

 ing grayish brown. 



Gelatin: Growth beaded. No aerial mycelium. Liquefaction rapid. No 

 soluble pigment. 



Milk: Growth good; no aerial mycelium. Coagulation; peptonization 

 slight. 



Starch: Hydrolysis. 



