CLASSIFICATION OF THE ACTINOMYCETES 13 



2. Growth on synthetic agar dark brown. 



a. Aerial mycelium dark gray ; spores globose. 



49. Streptomyces globosus 



b. Aerial mycelium white; spores cylindrical. 



50. Streptomyces cylindrosporus 



3. Growth on synthetic agar dark green; aerial mycelium white to 

 light green. 



51. Streptomyces viridochromogenes 



4. Pigment on synthetic agar deep brown to black. 



a. Growth on potato orange to orange-red ; growth on synthetic 

 agar brown to purplish; no aerial mycelium. 



52. Streptomyces purpeochromogenus 



b. Growth on potato brown to black. 



a 1 . Aerial mycelium on synthetic agar white to brownish. 



53. Streptomyces phaeochromogenus 



b 1 . Growth on synthetic media colorless to light orange; 

 aerial mycelium gray to cinnamon-drab. 



54. Streptomyces aureus 



5. Growth on synthetic agar grayish yellow; light yellow soluble 

 pigment. 



55. Streptomyces tanashiensis 



6. Soluble pigment on synthetic media red to rose-red. 



a. Soluble pigment on potato black. 



56. Streptomyces erythrochromogenes 



b. No soluble pigment on potato. 



57. Streptomyces collinus 



7. Aerial mycelium lavender to light tan or pink. 



a. Aerial mycelium cottony white, lavender to vinaceous-laven- 

 der-colored. 



58. Streptomyces lavendulae 



b. Aerial mycelium light tan to pink. 



59. Streptomyces venezuelae 



c. Aerial mycelium grayish pink to lavender. 



60. Streptomyces virginiae 



8. Aerial mycelium forms whorls. 



a. Growth gray-colored to brownish. 

 a 1 . Spores spherical. 



61. Streptomyces reticuli 

 b 1 . Spores cylindrical. 



62. Streptomyces netropsis 



