14 ACTINOMYCETES 



b. Growth dark gray to gray-green; spores cylindrical. 



63. Streptomyces verticillatus 



c. Spores produced in spirals; spores cylindrical, weakly pro- 

 teolytic. 



64. Streptomyces circulatus 



d. Whorls in secondary branches; growth yellowish red to pink. 



65. Streptomyces rubrireticuli 

 9. Growth on potato greenish to black. 



a. Growth on synthetic agar yellow to sulfur-yellow. 



66. Streptomyces flavus 



b. Growth on synthetic agar red to orange. 



67. Streptomyces ruber 



c. Growth on synthetic agar black. 



68. Streptomyces niger 



d. Growth on synthetic agar white. 



69. Streptomyces alboniger 



10. Growth on synthetic and organic media yellow; sporophores 

 straight. 



70. Streptomyces abikoensum 



11. Soluble brown pigment only occasionally produced; growth 

 usually colorless; odor very strong. 



71. Streptomyces odorifer 

 III. No soluble pigment produced in organic media. 



1. Proteolytic action strong. 



a. Growth yellowish to orange-brown. 



a 1 . Aerial mycelium white to rose-colored. 



72. Streptomyces roseoflavus 



b 1 . Growth only on potato and serum yellowish; aerial my- 

 celium white. 



73. Streptomyces putrificans 



b. Growth yellowish green to citron-yellow; aerial mycelium 

 white to yellow to pinkish. 



74. Streptomyces citreus 



c. Growth golden yellow to orange-colored; soluble pigment 

 yellow to orange. 



a 1 . Growth may also be red-brown and pigment orange. 



75. Streptomyces fulvissimus 



b 1 . Growth yellow; aerial mycelium powdery white. 



d. Growth colorless to cream-colored; aerial mycelium scanty, 

 white. 



76. Streptomyces chrysomallus 



