156 



THK ACTIXOMYCETKS. Vol. II 



I. Proteinaceous media are not pigmented dec]) 



brown or black; melanin-negative Soluble 



pigment on various media is faint brown, 



pink, red, purple, yellow, blue, or absent. 



1. Soluble pigment only faint yellow or 



faint brown. 



a. Aerial mycelium white, abundant. 

 a 1 . Sporophores produce spirals. 



a 2 . Occurs in soil and in certain 

 other natural substrates. 

 15. Streptomyces albus 

 b 2 . Occurs in the sea. 



148. Streptomyces marinus 

 b 1 . Sporophores straight. 



a 2 . Sporophores produce broom- 

 shaped clusters. 

 102. Streptomyces globispo- 

 rus 

 b 2 . No clusters produced. 

 a 3 . Nonproteolytic. 



27. Streptomyces autotro- 

 ph/ ClIS 



b 3 . Weakly proteolytic. 



179. Streptomyces orientalis 

 c 3 . Strongly proteolytic. 



129. Streptomyces kimberi 



b. Aerial mycelium, white, scant. 



250. Streptomyces willmorei 



c. Aerial mycelium white to light gray. 

 a 1 . Sporophores produce compact 



spirals. 



a 2 . Growth colorless. 



18. Streptomyces annular 

 tus 

 b 2 . Growth colorless to yellow- 

 ish. 



92. Streptomyces fungici 

 die us 

 c 2 . Growth brown to orange- 

 brown. 



21. Streptomyces arenat 

 d 2 . No growth on sucrose nitrate 



agar. 



22. Streptomyces argenteo- 

 lus 



I) 1 . Sporophores form loose spirals. 



40. Streptomyces calvus 

 c 1 . Sporophores straight or wavy, 

 a'-. Growth on sucrose nitrate 

 agar yellowish-brown. 



2. Streptomyces abura- 

 Vtensis 

 !)-'. ( irowt h gray to greenish. 



60. Streptomyces coroni 

 fur in is 



c 2 . Growth yellowish-white; 



utilizes paraffin and rubber. 

 68. Streptomyces elasticus 



d. Aerial mycelium white to mouse- 

 gray; spores bluish-gray. 



a 1 . Sporophores produce compact 

 spirals. 



227. Streptomyces spheroi- 

 des 

 b 1 . Sporophores in clusters; a few 

 compact spirals. 



45. Streptomyces catenulae 

 c 1 . Sporophores produce open cork- 

 screw spirals. 

 a 2 . Soluble pigment yellow. 



a 3 . Growth on synthetic 

 media cream-colored. 

 167. Streptomyces niveus 

 b 3 . Growth on synthetic me- 

 dia yellow. 

 143. Streptomyces macro- 

 sporeus 

 b 2 . Soluble pigment tan to 

 brown. 



35. Streptomyces caelestis 

 d 1 . Sporophores straight. 



111. Streptomyces griseolus 



e. Aerial mycelium white to gray, 

 covered with dark humid stains or 

 guttation drops. 



a 1 . Sporophores form spirals. 



a 2 . Growth buff to olive-colored. 

 189. Streptomyces platensis 

 b 2 . Growth colorless. 



123. Streptomyces humidus 

 b 1 . Sporophores straight. 



a 2 . Growth on potato cream- 

 colored. 



61. Streptomyces crate rife r 

 b 2 . Growth on potato slimy to 

 black. 

 235. Streptomyces tumuli 



f. Aerial mycelium green. 

 a 1 . Growth green. 



196. Streptomyces prasinus 

 b'. Growth colorless. 



121. Streptomyces hirsutus 

 c 1 . Growth red. 



195. Streptomyces prasino- 

 pilosus 



g. Aerial mycelium limited, produced 

 late; white with tinge of gray. 



97. Streptomyces gardneri 

 2. Soluble pigment blue or purple. 



