SPECIES OF STREPTOMYCES 101 



109. Streptomyces rubescens (Jarach) Umezawa, Tazaki, and Fuku- 

 yama. (Umezawa, H., Tazaki, T., and Fukuyama, S., Boll. Sez. Ital. Soc. 

 Intern. Microbiol., 3, 1931, 43; J. Antibiotics [Japan], 5, 1952, 469.) 



Aerial mycelium: Powdery, white, Microscopically aerial mycelium short, 

 curved, well-branched, bearing spherical or oval conidia in chain. No spirals. 



Synthetic agar: Submerged mycelium at first white, changing to salmon- 

 pink after about 10 days' incubation. No soluble pigment; reverse of growth 

 changes to salmon-pink. 



Nutrient agar: Same as on synthetic agar. 



Potato: Growth coral-pink; aerial mycelium powdery, white. Plug 

 changes slightly to brown. No soluble pigment. 



Gelatin : Surface growth coral-pink. No liquefaction and no pigmentation. 



Milk: Growth coral-pink; aerial mycelium powdery, white. No coagula- 

 tion and no digestion. Sometimes slightly reddish soluble pigment. 



Starch: No hydrolysis. 



Glucose broth : Surface growth with white powdery aerial mycelium be- 

 comes salmon-pink or coral-pink. The liquid later becomes coral-red. 



Nitrate: No reduction to nitrite. 



Blood agar: After 10 days' incubation, mycelium in the agar becomes 

 salmon-pink and bears powdery white aerial mycelium. No soluble pigment. 

 No hemolysis. 



Carrot: Growth dark reddish orange; aerial mycelium powdery, white. 

 Plug changes very slightly to dark color. 



Egg: Growth colorless, changing to coral-pink. Aerial mycelium powdery, 

 white. 



Loeffler's coagulated serum: Same as on synthetic agar. No hydrolysis. 



Antagonistic properties: Produces an antiviral agent, abikoviromycin. 



Remarks: No tyrosinase. It utilizes glycerol and glucose but not other 

 carbohydrates. 



110. Streptomyces viridis (Lombardo-Pelligrino emend. Krassilnikov) . 

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

 Moskau, 1941, 34.) 



Vegetative growth: Green to dark green on all media. No soluble pigment. 



Aerial mycelium: Well-developed on all media, cottony, whitish to gray- 

 ish; sporophores long or short, straight, forming no spirals, but frequently 

 producing broom-shaped clumps. Spores cylindrical, 1.0-1.5 by 0.7-0.8 /*• 



Gelatin: No liquefaction in 13 to 15 days. 



Milk: No coagulation and no peptonization. 



Starch : No hydrolysis. 



Cellulose: No growth. 



Nitrate: Reduction weak. 



