DESCRIPTION OF SPFCIFS OF STREPTOMYCES 



255 



digested by S. alboflavus but rapidly hy- 

 drolyzed by S. orientalis. Production of ae- 

 rial mycelium by the two cultures (lifters on 

 several media. 



ISO. Streptomyces paraguayensis (Al- 

 meida, L940) now comb. (Almeida, F. 

 Mycopathologia 2: 201-203, 1940). 



Morphology: Thin, ramified mycelial fila- 

 ments; aerial mycelium consists of thicker 

 and darker filaments, 1 m in diameter. Gram- 

 positive and nonacid-nonalcohol resistant. 



Glucose-peptone agar: Growth hard, ad- 

 hering to the medium; white with dark 

 center, gradually changing to dark yellow to 

 almost chocolate. 



Nutrient agar: Growth rough, adhering to 

 the medium; dark gray in color. 



Potato: Colonies cerebriform, white; 

 growth dry and friable. 



Gelatin: Growth on surface. No liquefac- 

 tion. 



Milk: Surface membrane, the milk colored 

 pink; no peptonization. 



Habitat : Thoracic mycetoma; dark heavy 

 grains. 



181. Streptomyces parvullus Waksman and 

 Gregory, 1954 (Waksman, S. A. and Greg- 

 ory, F. J. Antibiotics & Chemotherapy 4: 

 1 o;,() L056, L954). 



Morphology: Sporophores long, mono- 

 podially branched, twisting into long closed 

 spirals. Spores spherical, smooth (PI. I g). 



Sucrose nitrate agar: Growth abundant 

 with yellow reverse. Aerial mycelium ash- 

 gray. Soluble pigment yellow. 



Glucose-asparagine agar: Growth yellow. 

 Aerial mycelium abundant, gray. Soluble 

 pigment yellow. 



Nutrient agar: Growth yellowish, covered 

 with thin white aerial mycelium. Soluble pig- 

 ment yellow. Melanin-negative. 



Potato: Growth orange-colored, covered 

 with white to gray aerial mycelium. No solu- 

 ble pigment. 



Gelatin: Surface pellicle covered with 



heavy gray aerial mycelium. Liquefaction 

 slow. Soluble pigment yellow. 



Milk: Surface growth heavy, greenish-yel- 

 low. Aerial mycelium abundant, gray. Solu- 

 ble pigment brown. No coagulation, very 

 slow peptonization. 



Production of H 2 S: Negative. 



Antagonistic properties: Produces actino- 

 mycin D. 



Habitat: Soil. 



Type culture: IMRU 8077. 



182. Streptomyces parvus (Krainsky, 1914) 

 Waksman and Henrici, 1948 (Krainsky, A. 

 Centr. Bakteriol. Parasitenk. Abt. II., 41: 

 685-686, 1914). 



Morphology: Sporophores straight, 

 branched, or wavy; no true spirals; some 

 strains, however, produce spirals. Spores 

 oval, 0.9 to 1.3 by 1.2 to 1.8 /x- 



Sucrose nitrate agar: Growth yellow, rose 

 or red. Aerial mycelium light yellow to 

 white-rose. Soluble pigment rose-colored to 

 bright yellow. 



Calcium malate agar: Small yellow colo- 

 nies. Light yellow aerial mycelium. 



Nutrient agar: Growth yellow. Aerial my- 

 celium light yellow. Soluble pigment bright 

 yellow. 



Potato: Growth yellow to brown-yellow. 

 Aerial mycelium white to yellow. Melanin- 

 negative. 



Gelatin: Growth yellow. Soluble pigment 

 bright yellow. Liquefaction slow. 



Milk: No coagulation; rapid peptoniza- 

 tion. 



Starch agar: Growth rose-colored. Aerial 

 mycelium light gray. Hydrolysis positive. 



Cellulose: Growth good, rose-colored. Ae- 

 rial mycelium yellowish-gray. 



Nitrate reduction: Weak. 



Production of H 2 S: Negative. 



Antagonistic properties: Produces actino- 

 tnycin. 



Habitat: Soil. 



Remarks: Ettlinger et al. (1958) con- 



