CLASSIFICATION OF THE ACTINOMYCETES 17 



whitish to rose-white; pigment dissolves in fat-con- 

 taining media. 



105. Streptomyces longispororuber 



d 2 . Growth pale rose to red; aerial mycelium weakly de- 

 veloped, velvety, rose-white. 



106. Streptomyces oidiosporus 

 e 2 . Growth red; aerial mycelium black. 



107. Streptomyces melanocyclus 

 3. Proteolytic action very weak. 



a. Growth colorless; aerial mycelium whitish; acid-resistant. 



108. Streptomyces acidophilus 



b. Growth becoming salmon-pink; acid-sensitive. 



109. Streptomyces rubescens 



c. Growth green to dark green; aerial mycelium whitish to 

 grayish; no soluble pigment. 



1 10. Streptomyces viridis 

 Saprophytes; thermophilic. 



I. Growth on potato yellowish; diastatic. 



1. No aerial mycelium. 



111. Streptomyces thermophilics 



2. Aerial mycelium light gray. 



110. Streptomyces thermodiastaticus 

 II. Growth on potato abundant, dark-colored; nondiastatic. 



113. Streptomyces thermofuscus 

 III. Thermotolerant cultures. 



114. Streptomyces casei 



Plant parasites or cultures isolated from diseased plants or from soil 

 in which diseased plants were grown (after Millard and Burr). 

 I. Isolated from potato scab or from soil in which scabby potatoes 



were grown. 



1. Star-like colonies in glycerol synthetic solution. 



a. Deep pigment produced in nearly all media; tyrosinase posi- 

 tive. 



115. Streptomyces clavifer 



b. Deep pigment produced in protein media only; tyrosinase 

 positive. 



116. Streptomyces fimbriates 



c. Pale pigment produced in nearly all media; tyrosinase nega- 

 tive. 



117. Streptomyces carnosus 



d. No soluble pigment (or only trace) produced; minute craters 

 produced on sucrose and glucose media. 



118. Streptomyces craterifer 



