52 ACTINOMYCETES 



Synthetic agar: Growth good, diffuse, colorless, later becoming crumb- 

 like, light yellow. No aerial mycelium. Soluble pigment citron-yellow. 



Nutrient agar: Growth diffuse, colorless; light brown in reverse. No 

 aerial mycelium. Soluble pigment around bottom. 



Glucose agar: Growth good, yellow-brown reverse. Aerial mycelium 

 velvety white-gray to ash-gray. Soluble pigment yellow-brown. 



Potato: Growth moderate, brownish yellow to light brown. Aerial myce- 

 lium powdery gray-white. Soluble pigment citron-yellow to sulfur-yellow. 



Gelatin: Growth good, yellow-brown. No aerial mycelium. Soluble pig- 

 ment dark brown. Liquefaction complete. 



Milk: Growth good, lichnoid, light yellow. Aerial mycelium powdery 

 gray-white. Soluble pigment light brown. Peptonization strong. 



Starch: Colonies small yellowish, brownish in reverse. Aerial mycelium 

 velvety gray-white. Soluble pigment light gray. Hydrolysis strong. 



Cellulose: No growth. 



Glucose broth: Growth in the form of sediment, white, later light yellow. 

 No aerial mycelium. Soluble pigment citron-yellow. 



Glucose-asparagine agar: Growth good, crumb-like, light yellow, later 

 becoming black with citron-yellow reverse. Aerial mycelium white, later 

 ash-gray. Soluble pigment citron-yellow. 



Calcium malate agar: Growth good, crumb-like; dark yellow reverse. 

 Aerial mycelium powdery to velvety, white, later ash-gray. Soluble pig- 

 ment golden yellow. 



Source: Isolated from the edge of a river. 



26. Streptomyces griseoluteus Umezawa, Hayano, Maeda, Ogata, 

 and Okami. (J. Antibiotics [Japan], 4, 1951, 34-40; 5, 1952, 477-480.) 



Aerial mycelium: Hyphae branch monopodially and irregularly, conidia 

 oval to cylindrical, 1.0-1.2 by 1.8-2.2 p. 



Synthetic agar: Growth thin, colorless to cream-colored. Margin plumose, 

 penetrating into medium. Aerial mycelium powdery, grayish white to light 

 drab. Soluble pigment none or yellowish brown. 



Nutrient agar: Growth wrinkled, transparent; aerial mycelium thin, 

 white, powdery ; soluble pigment none or yellowish brown. 



Glucose agar: Growth wrinkled cream-colored. Aerial mycelium thin, 

 white; pigment reddish brown. 



Potato: Growth abundant, wrinkled, cream-colored: aerial mycelium 

 dusty white, thin; plug becoming slightly brownish. 



Gelatin: No growth. 



Milk: Ring cream-colored; surface patches white. 



Starch: Hydrolysis. 



