932 MANUAL OF DETERMINATIVE BACTERIOLOGY 



a*. Gray to sulfur-yellow pigment on potato. 



b. Aerial mycelium mouse-gray to light drab; starch is 

 hydrolyzed. 



38. Streptomyces olivaceus. 

 bb. Aerial mycelium yellowish-wiiite. 



39. Streptomyces lieskei. 

 bbb. No aerial mycelium; starch is hydrolyzed. 



40. Streptomyces microflavus. 

 a'. No soluble pigment on potato. 



41. Streptomyces cacaoi. 



2. Proteolytic action weak. 



a. Soluble pigment formed on synthetic agar, 

 b. Pigment blue or blue-black. 



42. Streptomyces novaecaesareae. 

 bb. Pigment brown to black. 



43. Streptomyces exfoliatus. 



44. Streptomyces gelaticus. 

 aa. No soluble pigment on synthetic agar. 



b^ Growth turning black; diastatic action strong. 



c. Growth on synthetic agar scant with abundant 

 spirals in aerial mycelium. 



45. Streptomyces rutgersensis. 



cc. No spirals on synthetic agar ; characteristic green- 

 colored growth on protein-glycerol medium. 



46. Streptomyces lipmanii. 



ccc. No spirals on synthetic agar; growth dark, almost 

 black. 



47. Streptomyces halstedii. 

 b". Moist aerial mycelium, many spirals. 



48. Streptomyces hygroscopicus. 

 h^. Growth orange-colored. 



49. Streptomyces fradiae. 

 b*. Growth yellowish. 



50. Streptomyces alboflavus. 



h^. Growth rose to red; aerial mycelium white. 



51. Streptomyces albosporeus. 



b^. Growth cream-colored; aerial mycelium flaky. 



52. Streptomyces flocculus. 

 b'. Growth red; aerial mycelium black. 



c. Complete decomposition of cellulose; weakly 

 diastatic. 



53. Streptomyces melanosporeus . 



cc. Incomplete decomposition of cellulose; strongly 

 diastatic. 



54. Streptomyces melanocyclus. 



3. No proteolytic action or very little. 



a. Acid-resistant strains. 



55. Streptomyces acidophilus. 

 aa. Non-acid-resistant. 



56. Streptomyces rubescens. 



