FAMILY STREPTOMYCETACEAE 931 



2. Growth and aerial mycelium green on synthetic agar. 



20. Sireptomyces viridochromogenes . 



3. Deep brown to black pigment on synthetic agar. 



a. Orange-red on potato; no aerial mycelium on synthetic agar; 

 growing feebly. 



21. Streptomyces purpeochromogenus . 



aa. Brown to black on potato; abundant cottony aerial mycelium 

 on synthetic agar, 

 b. Brown ring on milk culture; coagulated; peptonized. 



22. Streptomyces phaeochromogenus. 



bbb. Black ring on milk; no coagulation ; peptonization doubt- 

 ful. 



23. Streptomyces aureus. 



c^ Red to rose-red pigment on glucose, maltose, and 

 starch agar. 



24. Streptomyces erytkrochromogenes . 

 c^. Lavender-colored aerial mycelium. 



25. Streptomyces lavendulae. 



c^. Growth on potato gray with black center. 



2G. Streptomyces reticuli. 

 c*. Growth on potato cream-colored, becoming pink to 

 dark red. 



27. Streptomyces rubrireticuli. 

 c^. Growth on potato greenish-olive. 



d. Aerial mycelium straw-colored. 



28. Streptomyces flavus. 



dd. Aerial mycelium chrome-orange. 



29. Streptomyces ruber. 

 F. No soluble pigment formed on gelatin or other media. 



1. Proteolytic action strong in milk and gelatin. 



a^. Yellowish-green growth on starch with pinkish aerial mycelium. 



30. Streptomyces citreus. 



a-. Golden-yellow growth, later becoming orange to red-brown, on 

 synthetic media. 



31. Streptomyces fulvissirjius. 

 a'. Cream-colored growth on starch media. 



32. Streptomyces gougeroti. 



a.*. Bluish-black color on synthetic media, with white aerial myce- 

 lium. 



33. Streptomyces violaceoniger . 

 a^. Yellowish pigment on potato. 



b. Aerial mycelium thick, powdery, water-green; starch is hj-- 

 drolyzed. 



3-1. Streptomyces griseus. 

 bb. Aerial mycelium white; starch weakly hydrol3^zed. 



35. Streptomyces griseoflavus . 



a^. Greenish-black pigment on potato; aerial mycelium white. 



36. Streptomyces alhido flavus. 



aJ . Reddish-brown pigment on potato; aerial mycelium white; 

 starch is not h3'drolyzed. 



37. Streptomyces poolensis. 



