FAMILY STREPTOMYCETACEAE 



939 



gray aerial mycelium. Soluble j^ellow 

 pigment formed. 



Glucose agar : Abundant growth, gray 

 aerial mycelium. Soluble yellow pig- 

 ment . 



Starch agar : Same as on glucose agar. 



Glucose broth: Coarse, flaky growth. 

 Yellow pigment. 



Litmus milk: Peptonized. 



Potato : Light gray growth ; gray aerial 

 mycelium. 



Nitrates show slight reduction. 



Strong diastatic action. Esculin is h}'- 

 drolyzed. 



Cellulose is decomposed. 



Aerobic. 



Optimum temperature 30° to 35°C. 



Habitat: Soil. 



IL Streptomyces parvus (Krainsky) 

 comb. nov. (Actinomyces parvus Krainsky, 

 Cent. f. Bakt., II Abt., 41, 101-t, 662; 

 Nocardia parva Chalmers and Chris- 

 top herson, Ann. Trop. Med. and Para- 

 sit., 10, 1916, 268.) From Latin parvus, 

 small. 



Conidia more or less oval, 0.9 to 1.3 

 by 1.2 to 1.8 nucrons. 



Gelatin : Colonies yellow. Slow lique- 

 faction. 



Ca-malate agar: Small, j-ellow colonies 

 with light yellow aerial mycelium. 



Glucose agar : Same as on Ca-malate 

 agar. 



Starch agar : Same as on Ca-malate 

 agar. 



Glucose broth: Hemispherical colonies 

 in bottom of tube. 



Litmus milk : Peptonized. 



Nitrate slightly reduced. 



Moderate diastatic action. 



Cellulose not decomposed. 



Aerobic. 



Optimum temperature. 



Source : Garden soil . 



Habitat: Soil. 



12. Streptomyces malenconii (Duche) 

 comb. nov. {Actinomyces malenconi 

 Duch6, Encyclopedic Mycologique, Paris, 



6, 1934, 353.) Named for Mr. :\Ialeugou 

 from whom the original culture was 

 obtained. 



Gelatin: Poor growth; liquefaction. 



Asparagine glucose agar : Rapid opaque 

 growth, later becoming covered with 

 white aerial mycelium; amber-colored 

 pigment, dissolved in medium. 



Peptone agar : Cream-colored lobous 

 growth, covered with whitish aerial my- 

 celium. 



Asparagine glucose solution : Long, 

 much branching filaments, 0.5 to 0.7 

 micron; somewhat heavier aerial myce- 

 lium with a few irregular conidia; some 

 flaky growth on bottom of tube; surface 

 growth is cream-colored with rare white 

 aerial mycelium; liquid becomes slightly 

 j'ellow. 



Peptone solution : Whitish growth with 

 yellowish soluble pigment. 



Milk : Surface growth with whitish 

 aerial mycelium; slow peptonization, 

 liquid becoming brownish-colored. 



Potato : Rapid growth with thin white 

 mycelium; no soluble pigment. 



Coagulated serum : Radiating cream- 

 colored growth covered with white aerial 

 mycelium; slow liquefaction. 



No pigment on tyrosine medium. 



Source : Culture obtained from Mr. 

 Malengon, an inspector in Morocco. 



13. Streptomyces diastaticus (Krain- 

 sky) comb. nov. {Actinomyces diastati- 

 cus Krainsky, Cent. f. Bakt., II Bakt., 

 41, 1914, 662; Waksman and Curtis, Soil 

 Science, /, 1916, 116.) From M. L. 

 diastaticus, diastatic. 



Actinomyces roseodiastaticus Duche, 

 Encyclopedic Mycologique, Paris, 6, 1934, 

 329 is said to differ from both Krain- 

 sky's, and Waksman and Curtis' strains. 



Filaments may show fine, long, narrow 

 spirals. Conidia oval, 1.0 to 1.2 by 1.1 

 to 1.5 microns. 



Gelatin stab : Liquefied with small, 

 cream-colored flakes in liquid. 



Synthetic agar: Thin, gray, spreading 



