THE ACTIXOMYCKTKS. Vol. II 



Figvre 50. S. viridochromogenes grown for 30 

 Lechevalier, H. A. and Tikhonienko, A. S. Mikrol 



days on potato agar, X 13,500 (Reproduced from: 

 iologiya 29: 43-50, 1960). 



Aerial mycelium white. Soluble pigment 

 black. 



Gelatin: Surface growth cream-colored, 

 becoming greenish. Positive liquefaction. 

 Soluble pigment brown. 



Milk: Surface growth dark brown; coagu- 

 lation and peptonization. 



Starch agar: Colonies circular, spreading, 

 yellowish. Hydrolysis. 



Cellulose: No growth. 



Sucrose inversion: Positive. 



Nitrate reduction: Positive. 



Production of H2S: Positive. 



Tyrosinase reaction: Positive. 



Temperature: Optimum 37°C. 



Antagonistic properties: Active upon 

 fungi. 



Habitat: Soil. 



Remarks: This group occurs abundantly 

 in nature. Gause et al. (1958) described 

 various forms under different names, such 

 as A. bicolor, A. coeruleofuscus, A. coeruleo- 

 rubidus, and A. coerulescens, and a variety, 

 longisporus. According to Ettlinger et al. 

 (1958), S. chartreusis also belongs to this 

 group. 



247. Streptomyces riridoflavus Waksman 

 and Taber, \ { .)»:] (Waksman, S. A. and 

 Lechevalier, H. A guide to the classification 

 and identification of the actinomycetes and 

 their antibiotics. The Williams & Wilkins 

 Co., Baltimore, 1953, p. 66). 



Not A . viridiflavus Duche. 



Morphology: Sporophores formed in fas- 

 cicles; t nfts, with some curling of tips, are 

 produced on certain media. Tendency 1<> lose 



