CLASSIFICATION OF THE ACTINOMYCETES 19 



trace, produced on any media; colonies frequently show 

 dark centers. 



130. Streptomyces maculatus 



b 1 . Obligate aerobe; aerial mycelium arises centripetally on 

 the colonies. 



131. Streptomyces coroniformis 



5. No growth on glycerol synthetic solution, starch not hydrolyzed. 

 a. Growth in brom-cresol milk good; characteristic color 



changes. 



132. Streptomyces spiralis 



6. Other organisms isolated from potato scab. 



133. Streptomyces sampsonii 

 II. Grow on or isolated from sweet potatoes. 



134. Streptomyces intermedins 



1. Growth on synthetic agar olive-yellow; no aerial mycelium; no 

 soluble pigment on potato. 



135. Streptomyces ipomoea 



2. Growth on synthetic agar cream-colored; growth on potato 

 reddish brown with soluble pigment purple; aerial mycelium 

 white. 



136. Streptomyces poolensis 



III. Attack or isolated from scab of mangels and sugar beets. 



137. Streptomyces tumuli 



D. Isolated from animal tissues; in the animal body, hyphae often show 

 clavate enlargements at the ends. 



I. Limited proteolytic action in gelatin, milk, coagulated egg-albumen, 

 or fibrin. 



1. Vegetative growth white. 



a. No soluble pigment in organic media. 



138. Streptomyces listeri 



b. Soluble pigment in organic media brown to brown-red. 



139. Streptomyces galtieri 



2. Vegetative growth cream-colored; aerial mycelium scant, white. 



140. Streptomyces upcottii 



3. Growth very limited on various media, except on potato plug; 

 no liquefaction of gelatin. 



141. Streptomyces hortonensis 

 II. Strong proteolytic action in gelatin and milk. 



1. Growth on potato plug moist, membranous. 

 a. Pigment deep brown. 



142. Streptomyces beddardii 



