FAMILY STREPTOMYCETACEAE 



937 



Xunierous closed and open spirals on 

 all media. Conidia oval to elliptical. 



Gelatin stab: Liquefied; abundant, 

 yellowish, spreading pellicle. 



Synthetic agar: Growth light sulfur- 

 yellow turning to cadmium-j^ellow, pene- 

 trating deep into medium. Aerial my- 

 celium as white to ash-gray patches. 



Starch agar: White, spreading growth. 



Glucose agar: Restricted growth, sur- 

 face folded, raised. 



Plain agar : White, glistening, wrinkled 

 growth. 



Glucose broth: Thin, yellow pellicle. 



Litmus milk: Sulfur-yellow ring; co- 

 agulated; peptonized, with faintly alka- 

 line reaction. 



Potato: Abundant, wrinkled, cream- 

 colored growth. 



Nitrites produced from nitrates. 



Soluble empire-yellow pigment formed. 



Starch is hydrolj'zed. 



Aerobic. 



Optimum temperature 25°C. 



Habitat: Soil. 



6. Streptomyces bobiliae (Waksmanand 

 Curtis) comb. nov. (Actinomyces bobili 

 Waksman and Curtis, Soil Science, 1, 

 1916, 121.) From the name of a person. 



Mycelium with brandling hyphae. 

 Few close spirals of a dextrorse type. 



Gelatin stab: Dense, cream-colored to 

 brownish surface growth. Rapid lique- 

 faction . 



Synthetic agar: Abundant, glossy, 

 wrinkled, elevated, coral-red growth 

 becoming deep red. Scant, white aerial 

 mycelium. 



Starch agar: Restricted, tinely 

 wrinkled, coral-red growth with hyaline 

 margin . 



Plain agar: Restricted, glossy, gray 

 growth, becoming brownish. 



Glucose broth : Round colonies in iluid. 

 Flaky sediment. 



Litmus milk: Dark brown ring. Xo 

 coagulation. Peptonized. 



Potato: Thin, yellowish growth, be- 

 coming red, dry and wrinkled. 



Nitrites produced from nitrates. 

 Soluble brown pigment formed. 

 Starch is hydrolyzed. 

 Aerobic. 



Optimum temperature 37 °C. 

 Source : Isolated once from adobe and 

 garden soils. 

 Habitat : Soil. 



7. Streptomyces roseochromogenus 



(Jensen) comb. nov. {Actinomyces roseus 

 Krainsky, Cent. f. Bakt., II Abt., 4/, 

 1914, 662; Waksman and Curtis, Soil 

 Science, 1, 1916, 125; Waksman, Soil 

 Science, 8, 1919, 148; not Actinomyces 

 roseus Namyslowski, Cent. f. Bakt., I 

 Abt., Orig., 62, 1912, 567; Nocardia rosea 

 Chalmers and Christ opherson, Ann. 

 Trop. Med. and Parasit., 10, 1916, 270; 

 Actinomyces roseochromogenus Jensen, 

 Proc. Linnean Soc. New So. Wales, 56, 

 1931, 359.) From Latin, producing rose 

 color. 



Filaments with numerous open and 

 closed spirals. Conidia 1.0 to 1.2 by 1.5 

 to 3.0 microns. 



Gelatin stab : Liquefaction, with small, 

 cream-colored colonies in bottom of 

 liquid. 



Synthetic agar: Thin, spreading, color- 

 less growth. Aerial mj'celium thin, pale, 

 brownish. 



Starch agar: Colorless, spreading 

 growth. 



Glucose agar: Growth extensive, 

 spreading, colorless, entire. 



Plain agar: White growth, becoming 

 yellowish. 



Glucose broth : Cream-colored ring, 

 with flaky sediment. 



Litmus milk: Brownish ring. No co- 

 agulation. Peptonized in 10 to 15 days, 

 becoming strongly alkaline. 



Potato: Much wrinkletl, brownish 

 growth. 



Nitrites produced from nitrates. 



Purple pigment on egg media ; brown on 

 gelatin. 



Starch is hydrolyzed. 



Aerobic. 



