12 ACTINOMYCETES 



b. Growth on potato gray; no spirals formed. 



34. Streptomyces canescus 



c. Growth on potato yellowish-colored. 

 a 1 . Greenish tinge produced. 



35. Streptomyces fimicarius 

 b 1 . Pigment reddish brown. 



36. Streptomyces felleus 



c 1 . Soluble brown pigment on synthetic agar. 



37. Streptomyces achromogenes 



d. Growth on potato pink to reddish purple; spirals produced. 



38. Streptomyces noursei 

 II. Soluble pigment on organic media brown. 



1. Pigment deep brown (chromogenic types). 



a. Aerial mycelium thin, rose-colored. 

 a 1 . Spirals produced. 



39. Streptomyces roseochromogenus 

 b 1 . No spirals formed. 



40. Streptomyces cinnamonensis 



b. Aerial mycelium gray to brown to reddish. 



a 1 . Growth on organic media greenish to black. 



41. Streptomyces olivochromogenus 

 b 1 . Growth dark brown. 



42. Streptomyces resistomycificus 



c. Aerial mycelium cottony, dark brown; rapid liquefaction of 

 gelatin. 



43. Streptomyces diastatochromogenes 



d. Colonies yellow; aerial mycelium white to gray. 



44. Streptomyces flavochromogenes 



e. Growth white to gray; aerial mycelium white to gray. 



45. Streptomyces bikiniensis 



f. Growth white, fluffy; sporulating hyphae straight. 



45a. Streptomyces mirabilis 



g. Growth cream to brown-colored; aerial mycelium gray; spo- 

 rophores in clusters. 



46. Streptomyces antibioticus 



h. Aerial mycelium white, turning light pink on certain media; 

 sporophores straight, no spirals. 



47. Streptomyces griseocarneus 



i. Aerial mycelium greenish yellow, turning gray; sporophores 

 produced in tufts or whorls. 



48. Streptomyces viridoflavus 



