SPECIES OF STREPTOMYCES 55 



Cellulose: Growth good. 



Nitrate: Reduction to nitrite poor. 



Sucrose: Inversion ready. 



Antagonistic properties: Strongly antagonistic. 



Remarks: Related to Streptomyces candidus. Streptomyces nitrosporeus 

 Okami (J. Antibiotics [Japan], 5, 1952, 477-480) appears to be closely 

 related, if not identical. 



31. Streptomyces erythreus (Waksman) Waksman and Henrici. 



(Waksman, S. A., Soil Sci., 8, 1919, 112.) 



Vegetative growth: Growth spreading, with irregular margin, developing 

 deep into the medium; color at first white, later turning yellowish, agar 

 around growth has a white, milky surface. 



Aerial mycelium: Fine, branching; numerous open spirals formed as side 

 branches of the main hyphae. 



Synthetic agar: Aerial mycelium, thick, solid, white. 



Nutrient agar: Growth cream-colored. 



Glucose agar: Growth abundant, spreading, cream-colored, later turning 

 brown chiefly on surface; center raised, lobate margin. 



Potato: Growth wrinkled, cream-colored, becoming yellowish. 



Gelatin: growth abundant, dense, gray with pinkish tinge, chiefly on 

 surface of liquefied portion. 



Milk: Surface zone yellowish. Coagulation and peptonization. 



Starch: Growth cream-colored with faint greenish tinge. Hydrolysis. 



Glucose broth: Surface growth abundant, cream-colored. 



Nitrate : Reduction to nitrite. 



Temperature: Optimum 25°C. 



Antagonistic properties: Marked. Produces erythromycin. 



32. Streptomyces flavogriseus (Duche") comb. nov. (Duche\ J., Les 

 actinomyces du groupe albus, P. Lechevalier, Paris, 1934.) 



Aerial mycelium: Long, straight hyphae producing a few curling tips; 

 spores spherical. 



Synthetic agar: Growth limited, yellowish, reverse turning black; aerial 

 mycelium thin, gray to mouse-gray. 



Nutrient agar: Growth thin, cream-colored; aerial mycelium thin, white. 

 No soluble pigment. 



Glucose-peptone agar: Surface growth good, yellow; reverse tending to 

 turn dark. Aerial mycelium abundant, mouse-gray to drab. No soluble 

 pigment. 



Potato: Growth abundant, lichnoid. Aerial mycelium abundant, mouse- 

 gray to drab with white edge. No soluble pigment. 



