SPECIES OF STREPTOMYCES 91 



Starch: Growth thin, spreading, cream-colored. Hydrolysis positive. 



Glucose broth: Pellicle thin, cream-colored; sediment slight, flaky. 



Nitrate: Reduction to nitrite slight. 



Temperature: Optimum 25°C. 



Antagonistic properties: Positive; some strains show no activity. 



Remarks: Soluble brown pigment formed. 



91. Streptomyces glaucus (Lehmann and Schiitze emend. Krassilnikov) 

 comb. nov. (Krassilnikov, N. A., Actinomycetales, Akad. Nauk. USSR, 

 Moskau, 1941, 46.) 



Aerial mycelium: Well-developed, cottony, at first white then turning 

 green, similar to green penicillia. Sporophores form compact spirals with 

 3-5 turns. Spores oval to spherical, 1.0 by 0.8 /x. 



Synthetic agar: Growth colorless; soluble pigment brown. 



Nutrient agar: Growth heavy, covered with green aerial mycelium. 



Potato: Growth heavy, covered with velvety, green aerial mycelium. 



Gelatin: Liquefaction slow. 



Milk: Peptonization slow, with prior coagulation by some strains. 



Starch: Hydrolysis rapid. 



Cellulose: Growth good. 



Nitrate: Reduction. 



Sucrose: Inversion poor. 



Paraffin : Growth good. 



Antagonistic properties: All strains strongly antagonistic. 



92. Streptomyces rutgersensis (Waksman and Curtis) Waksman 

 and Henrici. (Waksman, S. A., and Curtis, R. E., Soil Sci., 1, 1916, 123.) 



Aerial mycelium: Filaments branching, with abundant open and closed 

 spirals; hyphae fine, long, branching. Conidia spherical and oval, 1.0-1.2 ju, 

 with tendency to bipolar staining. 



Synthetic agar: Growth thin, spreading, colorless, becoming brownish 

 to almost black. Aerial mycelium thin, white, becoming dull-gray. 



Nutrient agar: Growth thin, wrinkled, cream-colored. 



Glucose agar: Mycelium abundant, brown, becoming black with cream- 

 colored margin. 



Potato: Growth abundant, much-folded, white-gray. 



Gelatin: Surface growth spreading, cream-colored. Liquefaction. 



Milk: Ring cream-colored; coagulation; slow peptonization, becoming 

 alkaline. 



Starch: Growth gray, spreading. Hydrolysis. 



Nitrate: Reduction to nitrite. 



Temperature: Optimum 37°C. 



