86 



THE ACTINOMYCETES, Vol. II 



1. WAKSMAN AND CURTIS (1916) SYSTEM 



This system was based upon formation of 

 soluble pigments in organic media, rate of 

 gelatin liquefaction, and structure of aerial 

 mycelium. 



A. Gelatin rapidly liquefied; no brown pigment. 

 I. Spirals formed. 



1. No soluble pigment on synthetic media. 

 Actinomyces Rutgersi nsis 



2. Pigment formed on synthetic media. 



a. Pigment dark blue. 



Actinomyces violaceu&-( 'aeseri 



b. Pigment brown. 



Actinomyces diastaticus 

 II. No spirals. 



1. No soluble pigment. 



a. Growth orange-red, aerial mycelium 

 white. 



Actinomyces albosporeus 





J**^ 



f 



V 



« 



•K 



P 



Figure 24. Sporophores of Streptomyces sp. producing spirals, X 1500 (Courtesy of Miss A. Diet: 

 Dept of Microbiology, Upjohn Co., Kalamazoo. Mich.). 



