a*. Aerial mycelium white; spores cylindrical. 52. Strept077iyces cylindrosporus. 3. Growth on synthetic agar dark green; aerial mycelium white to light green. 53. Streptomyces viridochromogenes. 4. Pigments 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. 54. Streptomyces purpureochromogenes . a^. Growth on potato brown to black. b^ Aerial mycelium on synthetic agar white to brownish. 55. Streptomyces phaeochromogenes . b^. Growth on synthetic media colorless to light orange; aerial mycelium gray to cinnamon -drab. 56. Streptomyces aureus. 5. Growth on synthetic agar grayish yellow; light yellow soluble pigment. 57. Streptomyces tanashiensis . 6. Soluble pigment on synthetic media red to rose-red. a'. Soluble pigment on potato black. 58. Streptomyces erythrochromogenes. a^. No soluble pigment on potato. 59. Streptomyces collinus. 7. Aerial mycelium lavender to light tan or pink. a>. Aerial mycelium cottony white, lavender to vinaceous-lavender colored. 60. Streptomyces lavendulae. a^. Aerial mycelium light tan to pink. 61. Streptoviyces venezuelae. Si^. Aerial mycelium grayish pink to lavender. 62. Streptomyces virginiae. 8. Aerial mycelium forms whorls. a^ Growth gray-colored to brownish, b^ Spores spherical. 63. Streptomyces reticuli. h^. Spores cylindrical. 64. Streptomyces netropsis. a^. Growth dark gray to gray-green; spores cylindrical. 65. Streptomyces verticillatus . a^. Spores produced in spirals; spores cylindrical, weakly proteo- lytic. 66. Streptomyces circulatus. a"*. Whorls in secondary branches; growth yellowish red to pink. 67. Streptomyces ruhrireticuli. 9. Growth on potato greenish to black. a^. Growth on synthetic agar yellow to sulfur-yellow. 68. Streptomyces flavus. a^. Growth on synthetic agar red to orange. 69. Streptomyces ruber. a^. Growth on synthetic agar black. 70. Streptomyces niger. a'*. Growth on synthetic agar white. 71. Streptomyces alhoniger. 10. Growth on synthetic and organic media yellow; sporophores straight. 72. Streptomyces abikoensis.
