SPECIES OF STREPTOMYCES 105 



Glycerol synthetic solution: Numerous colonies covering surface of me- 

 dium and throughout medium; aerial mycelium scant white. 

 Habitat: Common scab of potatoes. 



117. Streptomyces carnosus (Millard and Burr) comb. nov. (Millard, 

 W. A., and Burr, S., Ann. Appl. Biol., 13, 1926, 580.) 



Vegetative growth: Good, wrinkled, on synthetic and organic media. 



Aerial mycelium: White to gray; spores cylindrical, 1.0 by 0.75 /x. 



Synthetic sucrose agar : Growth pale smoke-gray covered with abundant, 

 gray aerial mycelium. Colorless guttation drops appear over the whole sur- 

 face. 



Synthetic glucose agar: Growth pale olive-gray, covered with abundant 

 white to gray aerial mycelium. Soluble pigment ivory-yellow to cartridge- 

 buff. 



Nutrient potato agar: Growth heavy, lichnoid, gray-colored. Aerial myce- 

 lium scant, white to gray; property lost on cultivation. Pigment light golden 

 to brown. 



Potato: Growth good, lichnoid, covered with gray to brownish aerial 

 mycelium with white spots. The plug becomes colored gray to black. 



Gelatin: Growth covered with aerial mycelium, white in center, gray in 

 margin; liquefaction rapid. 



Milk: Surface growth good. No aerial mycelium. Coagulation followed 

 by liquefaction. 



Starch: Hydrolysis. 



Glucose broth: Whitish, sponge-like masses, sinking to bottom of tube. 



Tyrosinase reaction : Negative. 



Nitrate: Reduction. 



Glycerol synthetic solution: Whitish to gray, discrete colonies, clinging 

 to side or bottom of tube. Aerial mycelium scant, pale gray. 



Habitat: Potato scab. 



118. Streptomyces craterifer (Millard and Burr) comb. nov. (Millard, 

 W. A., and Burr, S., Ann. Appl. Biol., 13, 1926, 580.) 



Aerial mycelium: Much-branched; terminal branches dichotomously 

 forked. Spores rectangular, 1.3-0.9 by 1.0-0.8 n. 



Synthetic agar: Growth lichnoid, abundant, colorless; aerial mycelium 

 mouse-gray. Numerous guttation drops, which leave blackish craters. 



Nutrient agar: Growth colorless; aerial mycelium scant, white. No soluble 

 pigment. 



Potato: Growth good, cream-colored; aerial mycelium white to mouse- 

 gray. Color of plug unchanged. 



