SPECIES OF STREPTOMYCES 85 



Potato: Growth flat, colorless; aerial mycelium white. No soluble pig- 

 ment. 



Gelatin : Growth cream-colored. Liquefaction rapid. No soluble pigment. 



Milk: Growth cream-colored. Coagulation weak; peptonization rapid; 

 odor cheesy. 



Starch: Hydrolysis good. 



Cellulose: Growth good. 



Nitrate: Reduction slow. 



Odor: Strong, earthy. 



Antagonistic properties: Strong. 



Remarks : Closely related to Streptomyces albus ; differs by more delicate 

 growth, by a reverse that is often yellowish brown. Also related to Strep- 

 tomyces microfiavus, but differs from that described by Krainsky in that its 

 growth is never rose-yellow and in its abundant growth on potato. 



80. Streptomyces cinnamoneus Benedict, Pridham, and Lindenfelser. 

 (Benedict, R. G., Pridham, T. G., and Lindenfelser, L. A., in press.) 



Vegetative growth: Colonies large, with irregular margins. 



Aerial mycelium: White, gradually changing to flesh color. No spirals. 

 Spores globose, 0.6 y. in diameter. 



Synthetic agar : Growth colorless to white to cream-colored ; aerial myce- 

 lium white to light cinnamon. 



Nutrient agar: Growth cream to light lemon -yellow. No aerial mycelium. 



Glucose agar: Growth colorless; light greenish yellow to dull yellowish 

 orange in reverse; aerial mycelium white to cinnamon. 



Potato: Growth grayish white to yellow-green to light brown. Aerial 

 mycelium light gray to gray. No soluble pigment. 



Gelatin: Growth white, flocculent; no aerial mycelium. Liquefaction 

 rapid. No soluble pigment. 



Milk: Ring light brown; aerial mycelium limited, white. Peptonization 

 rapid, with alkaline reaction. 



Starch: Growth colorless to brownish; aerial mycelium white. Hydrolysis. 



Glucose broth: Ring white to lime-green. No aerial mycelium. 



Nitrate: No reduction. 



Carrot: Growth white to cream-colored. Aerial mycelium cretaceous. No 

 soluble pigment. 



Oatmeal agar: Growth tough, leathery, yellowish green to cream-yellow. 

 Aerial mycelium floccose, pale violet to faint cinnamon. Exudate tan to 

 white. 



Temperature: Good growth at 25°-37°C. 



Antagonistic properties: Produces cinnamycin, a polypeptide antibiotic. 



Source: Japanese soil. 



