CLASSIFICATION OF THE ACTINOMYCETES 7 



as a brown pigment of the type of melanin, which changes 

 the violet color of the culture to violet-black. 

 Strepiomyces violaceus-niger 



e. Cultures red-colored, producing pigments insoluble in water, 

 of the lipoactinochrome type; color of medium not changing 

 with acidity. 



a 1 . Cultures not forming any brown or black pigments; they 

 are always red, sometimes with a brownish tinge but not 

 black. 

 a 2 . Saprophytes. 



Streptomyces ruber 

 b 2 . Parasites. 



Streptomyces madurae 

 b 1 . Cultures producing on synthetic media, in addition to pig- 

 ments, a black or dark brown substance which gives the 

 culture a red-brown to black color. 



Streptomyces melanocyclus 



f. Cultures yellow, citron-yellow, or brownish yellow. 

 a 1 . Saprophytes. 



Streptomyces flavus 

 b 1 . Parasites. 



a 2 . Living in bodies of men and warm-blooded animals. 



Streptomyces hominis 

 b 2 . Living in bodies of cold-blooded animals. 



Streptomyces lacertae 

 c 2 . Living on plants. 



Streptomyces setonii 



g. Cultures orange. 

 a 1 . Saprophytes. 



Streptomyces aurantiacus 

 b 1 . Parasites . Streptomyces phenotolerans 

 h. Cultures green or brownish green. 



Streptomyces viridochromogenes 

 i. Cultures black, producing a pigment of the melanin type. 



Streptomyces niger 

 j. Cultures pigmented dark brown, but not black. 

 a 1 . Saprophytes. 



Streptomyces chromogenes 

 b 1 . Parasites . . Streptomyces gracilis 

 Spores cylindrical or elongated. 



