SPECIES OF STREPTOMYCES 71 



Potato: Growth brown; aerial mycelium dark gray to whitish gray; 

 soluble pigment dark brown. 



Gelatin: Brown pigment. Rapid liquefaction. 



Milk - Yellowish surface ring; coagulation and peptonization. 



Starch - Hydrolysis. 



Nitrate: No reduction. 



Tyrosinase reaction: Positive. 



Optimum pH: 5.8-6.5. 



Antagonistic properties: Produces luteomycin. 



Remarks: Resembles Stretomyces aureus and Streptomyces antibioticus. 

 Carbon sources : starch most suitable, followed by glycerol. Nitrogen source: 

 peptone and meat extract best. 



56. Streptomyces erythrochromogenes (Krainsky) Waksman and 

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



Aerial mycelium: Conidia oval, about 2.0 /x long. 



Nutrient agar: Soluble pigment brown. Aerial mycelium white. 



Glucose agar: Red pigment formed. 



Potato: Aerial mycelium gray. Medium colored black. 



Gelatin: Colony growth slow. Liquefaction. Soluble brown pigment 

 formed. 



Starch: Soluble pigment on old cultures rose. Diastatic action weak. 



Cellulose: No growth. 



Glucose broth: Growth abundant. Colonies floating, later a pellicle is 

 formed. Soluble pigment brown. 



Nitrate: Reduction slight. 



Calcium malate agar: Colonies circular, with aerial mycelium grayish- 

 white-margined. 



Temperature: Optimum 30°C. 



Antagonistic properties: Active against various bacteria. 



57. Streptomyces collinus Lindenbein (Lindenbein, W., Arch. Mikro- 

 biol., 17, 1952, 361-383.) 



Aerial mycelium: Produces spirals, oval spores. 



Synthetic agar: Growth good, crumb-like, light brown to red-brown in 

 reverse. Aerial mycelium chalk-white. Soluble pigment yellow-brown, later 

 becoming reddish brown. 



Nutrient agar: Growth good, crumb-like, dark brown. Aerial mycelium 

 powdery gray-white. Soluble pigment dark brown. 



Glucose agar: Growth good, reverse yellow-brown and red. Aerial myce- 

 lium velvety and chalk-white. Soluble pigment chestnut-brown. 



