10 ACTINOMYCETES 



b 2 . Pigment at first yellow-red, changing to blue or bluish 

 green. 



7. Streptomyces pluricolor. 

 c 2 . Pigment unchanged with acidity. 



8. Streptomyces cyaneus 

 b 1 . No spirals formed. 



9. Streptomyces vinaceus 



b. Weakly proteolytic; aerial mycelium poorly developed. 



10. Streptomyces violaceus 



3. Pigment at first green, becoming brown. 



a. Aerial mycelium usually absent. 



11. Streptomyces verne 



b. Aerial mycelium dark gray, olive-colored, or gray-green. 



12. Streptomyces viridans 



4. Growth pink on synthetic media, yellowish on organic media; 

 no soluble pigment. 



13. Streptomyces calif ornicus 



5. Growth yellow to greenish or orange-colored; soluble pigment 

 yellow to golden yellow. 



a. Growth yellow to green; pigment insoluble. 



14. Streptomyces virgatus 



b. Growth sulfur-yellow; soluble pigment yellow. 

 a 1 . Conidia oval to elliptical. 



a 2 . Aerial mycelium white. 



15. Streptomyces flaveolus 

 b 2 . Aerial mycelium light yellow. 



16. Streptomyces parvus 



c 2 . Aerial mycelium white to gray to reddish gray. 



17. Streptomyces xanthophaeus 

 b 1 . Conidia spherical; cellulose decomposed. 



18. Streptomyces cellulosae 



c. Growth reddish brown to orange-colored to cinnamon-drab, 

 covered with white to gray aerial mycelium ; soluble pigment 

 on synthetic media yellowish. 



a 1 . No soluble pigment on gelatin. No peptonization of milk. 



19. Streptomyces rimosus 



b 1 . Faint yellowish coloration of liquefied gelatin. Milk rap- 

 idly peptonized. 



20. Streptomyces griseoflavus 

 c 1 . Soluble pigment golden yellow. 



21. Streptomyces aureofaciens 



