SPECIES OF STREPTOMYCES 99 



105. Streptomyces longispororuber (Krassilnikov) comb. nov. (Kras- 

 silnikov, N. A., Actinomycetales, Akad. Nauk. USSR, Moskau, 1941, 22.) 



Vegetative growth: Colonies pigmented dark red to purple-red to light 

 rose. Little pigment dissolves into the media, except those containing fat. 

 Certain strains secrete a soluble brown substance in protein-containing 

 media. 



Aerial mycelium: Weakly developed, whitish to rose-white; sporophores 

 in some strains well-developed, velvety, long, straight, seldom forming 

 open spirals. Spores cylindrical to elongated, 1.0-1.5 by 0.7/u, with sharply 

 cut ends; a few are slightly swollen, becoming oval or spherical, 1 y. in di- 

 ameter. 



Synthetic agar: Growth light red to pale rose; pigment insoluble in me- 

 dium. 



Gelatin: Liquefaction medium. 



Milk: Coagulation weak; peptonization fair to good. 



Starch: Hydrolysis slow to good. 



Cellulose: No growth of some strains; others make some growth. 



Nitrate: Reduction positive for some strains. 



Antagonistic properties: Strongly antagonistic to a number of bacteria. 



Remarks: Related to Streptomyces ruber, except for the cylindrical spores. 

 Very variable, especially as regards production of aerial mycelium. 



106. Streptomyces oidiosporus (Krassilnikov) comb. nov. (Krassilni- 

 kov, N. A., Actinomycetales, Akad. Nauk. USSR, Moskau, 1941, 23.) 



Vegetative growth: Colonies red and rose to pale. Pigment insoluble in 

 medium. 



Aerial mycelium: Poorly developed, covering medium with velvety rose- 

 white color. Sporophores straight or wavy, never forming spirals; they are 

 short or long, frequently forming broom-shaped structures. Oidiospores pro- 

 duced by segmentation of sporophores. Spores 1.0-1.8 by 1.0 p, frequently 

 appearing as double cocci. 



Gelatin: Aerial mycelium weakly developed, frequently lacking; hyphae 

 short, covering colony as rose-white velvet; frequently occurs in spots or 

 is absent. Liquefaction weak. 



Milk: No coagulation; peptonization medium. 



Starch: Hydrolysis rapid. 



Cellulose: No growth. 



Nitrate: Reduction positive. 



Antagonistic properties: None. 



Remarks: Cultures resemble Streptomyces ruber and Streptomyces longi- 

 spororuber. Some strains were obtained as variants of Nocardia rubra. 



