126 



THE ACTINOMYCETES, Vol. II 



Table 13 

 Characterization of Streptomyces parvus (Waksman, 1957) 



* Calcium malate agai 



plug, it produced yellow-gray growth with a 

 faint brownish soluble pigment; on gelatin, 

 it formed a surface growth with white aerial 

 mycelium, with a yellowish or brownish 

 soluble pigment, and good liquefaction of the 

 gelatin; on milk, it produced good grayish 

 growth. These characteristics, together with 

 the ability to produce oxytetrac/ycline, defi- 

 nitely placed the culture in the S. rimosus 

 species. Emphasis was laid upon the tact it 



formed flat colonies, hardly folded and not 

 cracked like those of S. rimosus; it showed 

 concentric circles in the aerial mycelium, a 

 variable property. It did not form nitrite 

 from nitrate, and it did not hydrolyze starch; 

 these two properties were hardly sufficient, 

 however, to justify the recognition of S. 

 arm Hint its as a new species. 



Among the various members of the Flavus 

 series, the actinomycin-prodncers occupy an 



