FAMILY III. STKEPTOMYCETACEAE 751 



whitish to rose-white; pigment dissolves in fat- 

 containing media. 



108. Streptomyces longispororuber. 



c*. Growth pale rose to red; aerial mycelium weakly 

 developed, velvety, rose-white. 



109. Streptomyces oidiosporus. 

 c^ Growth red; aerial mycelium black. 



110. Streptomyces melanocyclus. 

 3. Proteolytic action very weak. 



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



111. Streptomyces acidophilus. 

 a^. Growth becoming salmon-pink; acid-sensitive. 



112. Streptomyces rubescens. 



a'. Growth green to dark green; aerial mycelium whitish to gray- 

 ish; no .soluble pigment. 



113. Streptomyces viridis. 

 II. Saprophytes; thermophilic. 



A. Growth on potato yellowish; diastatic. 



1. No aerial mycelium. 



114. Streptomyces therinophilus . 



2. Aerial mycelium light gray. 



115. Streptomyces thermodiastaticus . 



B. Growth on potato abundant, dark colored; non-diastatic. 



116. Streptomyces thermojuscus. 



C. Thermotolerant cultures. 



117. Streptomyces casei. 



III. Plant parasites or cultures isolated from diseased plants or from soil in which diseased 

 plants were grown (after Millard and Burr) . 

 A. Isolated from potato scab or from soil in which scabb}' potatoes were grown. 



1. Star-like colonies in glycerol synthetic solution. 



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



118. Streptomyces clavifer. 



a''. Deep pigment produced in protein media only; tyrosinase- 

 positive. 



119. Streptomyces jimhriatus. 



a^. Pale pigment produced in nearly all media; tyrosinase-negative. 



120. Streptomyces carnosus. 



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

 produced on sucrose and glucose media. 



121. Streptomyces craterifer. 



2. Surface growth heavy on glycerol synthetic solution with abundant aerial 

 m3'celium. 



ai. Aerial mycelium on nutrient potato agar limited, pale gray. 



122. Streptomyces gracilis. 



a^. Aerial m3^celium on nutrient potato agar abundant, white; 

 gelatin liquefaction stratiform; no soluble pigment. 



123. Streptomyces praecox. 



a^. Gelatin liquefaction stratiform; soluble pigment produced. 



124. Streptomyces setonii. 



EL*. Abundant aerial mycelium on nearly all media; pigment on 

 Camalate-glycerol agar carnelian red. 



125. Streptomyces praefecundus . 



