84 ACTINOMYCETES 



Milk: Surface growth cream-colored. Aerial mycelium thin, white. Pep- 

 tonization rapid. 



Starch: Hydrolysis rapid. 



Nutrient broth: Ring on surface cream-colored; flake3 throughout me- 

 dium. No soluble pigment. Aerial mycelium white. 



Nitrate: No reduction. 



Coagulated serum : Growth cream-colored, covered with white aerial my- 

 celium; liquefaction rapid. 



Synthetic solution: Submerged mycelium in form of flakes, later forming 

 a surface pellicle; no soluble pigment. 



Antagonistic properties: Active against fungi. 



Remarks: This culture is believed to be intermediate between Strepto- 

 myces albus, with its abundant aerial mycelium, and Streptomyces almquisti, 

 with its very scant aerial mycelium. 



78. Streptomyces farinosus (Krassilnikov) comb. nov. (Krassilnikov, 

 N. A., Actinomycetales, Akad. Nauk. USSR, Moskau, 1941, 51.) 



Vegetative growth: Colonies colorless, smooth or rough. 



Aerial mycelium: Powdery white on some media. Sporophores straight 

 or wavy, singly or in clumps, forming no spirals. Organism produces seg- 

 mented spores or oidiospores, cylindrical, 1.2-1.7 by 0.6-0.8 /x. Some form 

 oval or even spherical spores, produced by swelling of cylindrical forms. 



Synthetic agar: Aerial mycelium poorly developed and spotty. 



Potato: Growth colorless; aerial mycelium poorly developed. 



Gelatin: Liquefaction fair to good. 



Milk: Coagulation and rapid peptonization. 



Starch: Hydrolysis rapid. 



Cellulose: Growth of some strains. 



Nitrate: Reduction fair. 



Sucrose : Inversion of most strains, ready. 



Antagonistic properties: None or very weak. 



79. Streptomyces albidus (Duch6) comb. nov. (Duch6, J., Les acti- 

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



Aerial mycelium: Whitish but not snow-white. Sporophores long, open 

 spirals. Spores spherical to oval. Soluble pigment produced in synthetic 

 and other media. 



Synthetic agar: Growth colorless ; some drops of colorless guttation. Aerial 

 mycelium white. Pigment yellowish. 



Peptone agar: Growth colorless; aerial mycelium white; reverse slightly 

 greenish; soluble pigment yellowish. 



