116 ACTINOMYCETES 



134. Streptomyces intermedius (Kriiger emend. Wollenweber) comb, 

 nov. (Wollenweber, H., Ber. Deut. Botan. Ges., 39, 1922, 26.) 



Vegetative growth: Original description recorded colonies green-colored, 

 soluble pigment green. On continued cultivation, green color tends to be- 

 come cream-colored to brownish. 



Aerial mycelium: Light gray to gray. Sporophores straight, frequently 

 arranged in clumps. Spores elongated, 0.9-1.0 by 0.7/i. 



Synthetic agar: Growth slightly folded, cream-colored to brown. Aerial 

 mycelium thin, white. 



Nutrient agar: Growth much-folded, cream-colored. Aerial mycelium in 

 upper portions of slant white. Soluble pigment faintly golden. 



Glucose agar: Growth good, brownish. Aerial mycelium heavy, cream- 

 colored. No soluble pigment. 



Potato: Growth folded, brown. Trace of white aerial mycelium in upper, 

 drier portions of growth. No soluble pigment. 



Gelatin: Growth thin, colorless to faintly brown, dropping to bottom. 

 No soluble pigment. Liquefaction slow. 



Milk: Surface growth heavy, cream-colored. No aerial mycelium. No 

 coagulation; peptonization slow. 



Starch: Growth same as on synthetic agar. Hydrolysis good. 



Nutrient broth: Film thin, colorless, dropping to bottom. No aerial my- 

 celium. No soluble pigment. 



Nitrate: Reduction limited. 



Sucrose: Inversion slow. 



Antagonistic properties: Positive. 



Habitat: Potato scab. 



135. Streptomyces ipomoea (Person and Martin) Waksman and Hen- 

 rici. (Person, L. H., and Martin, W. J., Phytopathology, 30, 1940, 913.) 



Conidia on glucose-casein agar: Oval to elliptical, 0.9-1.3 by 1.3-1.8 /x. 



Synthetic agar: Growth abundant, mostly on surface of medium, mod- 

 erately wrinkled, olive-yellow. 



Nutrient agar: Moderate growth in the form of small, shiny, crinkled 

 colonies both on the surface and imbedded in the medium, silver-colored. 



Potato: Growth moderate, shiny, wrinkled, light brown. No aerial myce- 

 lium. No soluble pigment. 



Gelatin: After 25 days at 20°C, scanty growth, no aerial mycelium; no 

 soluble pigment; liquefaction. 



Milk: Growth in form of ring; hydrolysis, without visible coagulation. 



Starch: Growth moderate, smooth, deep in medium, ivory-colored. Aerial 

 mycelium white with patches of bluish green. No soluble pigment. Complete 

 hydrolysis after 12 days. 



