SPECIES OF STREPTOMYCES 109 



Milk: Surface growth good, covered with scant, white aerial mycelium. 

 Coagulation, followed by peptonization. 



Starch: Hydrolysis. 



Glucose broth: Masses throughout medium flaky, whitish. Aerial my- 

 celium abundant, pale olive-buff. Soluble pigment light golden brown. 



Nitrate: Reduction. 



Glycerol synthetic solution: Surface growth heavy, covered with white 

 to olive-buff aerial mycelium. Soluble pigment none or very slight green. 



Tyrosinase reaction : Negative. 



Temperature: Grows well at 37.5°C. 



Habitat: Potato scab and soil. 



123. Streptomyces viridogenes (Millard and Burr) comb. nov. (S. viri- 

 dis of Millard, W. A., and Burr, S., Ann. Appl. Biol., IS, 1926, 580.) 



Aerial mycelium: Filaments long, straight. Spores spherical 0.9 p.. 



Synthetic sucrose agar: Growth abundant, covered with olive-grayish 

 aerial mycelium. Soluble pigment greenish yellow to blackish green. 



Synthetic glucose agar: Growth smooth, raised, olive-buff. Aerial myce- 

 lium abundant, light gray to deep mouse-gray. Soluble pigment yellowish 

 to greenish yellow. 



Nutrient agar with glucose: Growth gray to black. Aerial mycelium 

 gray. Soluble pigment dark brown. 



Nutrient agar: Growth lichnoid, cream-colored. No aerial mycelium. No 

 soluble pigment. 



Potato: Growth gray to olive-gray. Aerial mycelium either absent or 

 white, turning gray. Soluble pigment brown. 



Gelatin: Growth grayish, aerial mycelium scant, white to gray. Lique- 

 faction rapid. Soluble pigment light golden brown. 



Milk: Surface growth good; growth in medium cloudy. Aerial mycelium 

 scant white. Coagulation rapid and peptonization gradual. 



Starch: Growth gray to brown. Aerial mycelium thin, white. Hydrolysis. 



Nutrient broth: Thin surface and bottom flaky growth, cream-colored. 

 No soluble pigment. 



Glucose broth: Growth on surface and at base good, flaky. Aerial myce- 

 lium gray to mouse-gray. Soluble pigment vinaceous to cinnamon-colored. 



Nitrate: Reduction positive; occasionally negative. 



Glycerol synthetic solution: Growth in medium and on surface flaky, 

 white to vinaceous. Aerial mycelium gray. 



Tyrosinase reaction : Negative. 



Temperature: Grows well at 37.5°C. 



Habitat: Potato scab. 



