104 ACTINOMYCETES 



Synthetic sucrose agar: Gray to brick-red growth; white, sprinkled with 

 cinnamon-drab, aerial mycelium. Yellowish to brown soluble pigment. 



Synthetic glucose agar: Growth gray to brown; white to drab-colored 

 aerial mycelium. Cinnamon-buff to brown soluble pigment. 



Nutrient potato: Growth wrinkled gray to grayish olive; trace of aerial 

 mycelium. Deep golden brown soluble pigment. 



Potato: Growth wrinkled gray to orange to brown; gray to olive-buff 

 aerial mycelium. Color of plug gray to brown. 



Gelatin: Growth gray to buff; white aerial mycelium. Medium liquefac- 

 tion. Yellow to reddish yellow soluble pigment. 



Starch: Hydrolysis. 



Glucose broth : Sponge-like growth at bottom of tube. Deep golden brown 

 soluble pigment. 



Tyrosinase reaction : Positive. 



Nitrate: No reduction. 



Glycerol synthetic solution : Growth in form of compact colonies at bot- 

 tom and along sides of tube with some on surface, colored salmon to brown ; 

 scant drab aerial mycelium. Buff to golden soluble pigment. 



Temperature: Fair growth at 37.5°C. 



Habitat : Limed soil and common scab of potatoes. 



116. Streptomyces fimbriatus (Millard and Burr) comb. nov. (Millard, 

 W. A., and Burr, S., Ann. Appl. Biol., IS, 1926, 580.) 



Vegetative growth: Chocolate-colored. 



Aerial mycelium: Mouse-gray. Sporophores form spirals with 3 or more 

 turns. Spores cylindrical to oval, 1.2-0.9 by 0.9 ju- 



Synthetic sucrose agar: Growth gray; aerial mycelium abundant, white 

 to gray, with a few specks of white. Soluble pigment cream-colored. 



Synthetic glucose agar: Growth very good; aerial mycelium white to 

 mouse-gray. 



Nutrient potato agar: Colonies gray to blackish, flat, raised in center; a 

 few specks of white aerial mycelium. Soluble pigment golden brown. 



Potato: Growth mouse-gray; aerial mycelium on dried portions of growth 

 scant white to mouse-gray. Pigment around growth black. 



Gelatin: Growth good; aerial mycelium white. Liquefaction slow. Soluble 

 pigment reddish. 



Milk: Growth good. No coagulation and no hydrolysis. 



Starch: Hydrolysis positive. 



Glucose broth: Growth flocculated, mostly at bottom; no aerial myce- 

 lium. Soluble pigment golden brown. 



Tyrosinase reaction : Strongly positive. 



Nitrate: Reduction positive. 



