752 ORDER V. ACTINOMYCETALES 



3. Surface growth fair on glycerol synthetic solution with some aerial mycelium. 



a'. Soluble pigment (often green) produced on all solid media. 



126. Sireptomyces viridogenes . 



a^. Soluble pigment (yellow) produced on all synthetic media. 



127. Streptomyces loidensis. 



a^. Soluble pigment none or only poor; decided clot produced in 

 milk. 



128. Streptomyces wedmorensis. 



4. Surface growth scant or none, but some bottom growth on glycerol synthetic 

 solution. 



a'. Color changes produced in brom-cresol milk. 



b^ Tyrosinase-positive; no aerial mycelium on nutrient po- 

 tato agar. 



129. Streptomyces scabies. 



b^. Tyrosinase-negative; aerial mycelium produced on all 

 solid media. 



c^. Aerial mycelium on synthetic sucrose agar abun- 

 dant, 

 d^ Growth good on egg-albumen agar with 

 abundant aerial mycelium. 



130. Streptomyces tenuis. 



d^. Growth poor on egg-albumen agar with scant 

 aerial mycelium. 



131. Streptomyces marginatus. 



c^. Aerial mycelium on synthetic sucrose agar scant; 

 no true aerial mycelium produced on any medium; 

 colonies often show dark centers. 



132. Streptomyces salmonicolor. 

 a*. No color changes produced in brom-cresol milk. 



bi. Facultatively anaerobic; no true aerial mycelium, or only 

 trace, produced on any medium; colonies frequently show 

 dark centers. 



133. Streptomyces maculatus. 



b^. Obligately aerobic; aerial mycelium arises centripetally 

 on the colonies. 



134. Streptomyces coroniformis. 



5. No growth on glycerol synthetic solution; starch not hydrolyzed. Growth in 

 brom-cresol milk good; characteristic color changes. 



135. Streptomyces spiralis. 



6. Other organism isolated from potato scab. 



136. Streptoviyces sampsonii. 



B. Grow on or isolated from sweet potatoes. 



137. Streptomyces intermedins. 



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

 on potato. 



138. Streptomyces ipomoeae. 



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

 soluble pigment purple; aerial mycelium white. 



139. Streptomyces poolensis. 



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



140. Streptomyces tumuli. 



IV. Isolated from animal tissues; in the animal body, hyphae often show clavate enlarge- 

 ments at the ends. 



