SPECIES OF STREPTOMYCES 47 



white, tending later to disappear. Soluble pigment light yellow, later orange- 

 yellow. 



Glucose-asparagine agar: Growth good, diffuse, colorless, light yellow 

 reverse. Aerial mycelium powdery white. Soluble pigment light yellow. 



Calcium malate agar: Growth very good, crumb-like, with yellowish red 

 reverse. Aerial mycelium velvety, white-gray or reddish gray. Soluble pig- 

 ment dark red-yellow. 



Antagonistic properties: Produces antibiotics. 



18. Streptomyces cellulosae (Krainsky) Waksman and Henrici. 

 (Krainsky, A., Centrbl. Bakt. II, 41, 1914, 639-688.) 



Vegetative growth : Yellow, producing soluble yellow pigment. No soluble 

 brown pigment. 



Aerial mycelium: Well-developed, gray to white-gray. Spores almost 

 spherical, 1.3 y. in diameter, often arranged in chains. 



Nutrient agar: Aerial mycelium white. 



Glucose agar: Growth abundant; aerial mycelium gray. Soluble yellow 

 pigment. 



Potato: Growth colorless; aerial mycelium gray. 



Gelatin: Colonies circular, yellowish. Liquefaction. 



Milk: Coagulation and peptonization rapid. 



Starch: Diastatic action strong. 



Cellulose: Growth good; decomposition limited. 



Glucose broth: Growth coarse, flaky. Yellow pigment. 



Nitrates: Reduction slight. 



Esculin: Hydrolyzed. 



Calcium malate agar: Colonies yellowish; aerial mycelium gray. Soluble 

 yellow pigment. 



Temperature: Optimum 30°-35°C. 



Antagonistic properties: Positive. 



19. Streptomyces rimosus Sobin, Finlay, and Kane. (U. S. Pat. 

 2,516,080, July 18, 1950.) 



Vegetative growth: Colonies flat, smooth, irregular edge, yellow-pig- 

 mented. 



Aerial mycelium : Between white and pallid quaker drab; spirals numer- 

 ous; conidia 0.6-0.7 by 0.8-1.4 n, cylindrical. 



Nutrient agar: Growth poor, no aerial mycelium, faint yellowish pigment. 



Glucose agar: Growth with dry, cracked surface; aerial mycelium mouse- 

 gray; yellowish brown pigment. 



Potato: Growth moderate, wrinkled; aerial mycelium white to dark; 

 yellowish brown pigment. 



