CLASSIFICATION OF THE ACTINOMYCETES 9 



2. Spores produced by means of segmentation of aerial hyphae. 



a. Cultures colorless 



Streptomyces farinosus 



b. Cultures pigmented red. 



Streptomyces oidiosporus 



c. Cultures yellow-orange. 



Streptomyces longissimus 



d. Cultures brown. 



Streptomyces fumosus 

 B. Sporophores produced in whorls. 

 I. Sporophores straight. 



Streptomyces verticillatus 

 II. Sporophores spiral-shaped. 



1. Spores spherical, oval. 



Streptomyces reticuli 



2. Spores cylindrical, elongated. 



Streptomyces circulatus 



Classification System of Waksman and Henrici 



A. Saprophytes; psychrophilic to mesophilic. 



I. Soluble pigment on organic media absent, or faint brown, pink, 

 purple, golden yellow, or blue. 



a. Pigment absent, or only faint brown pigment produced in pro- 

 tein media. 



a. Aerial mycelium abundant, white. 



a 1 . Spirals formed; spores spherical to ellipsoidal. 



1. Streptomyces albus 



b 1 . Long, open spirals; spores cylindrical. 



2. Streptomyces longisporus 



c 1 . Straight sporophores, forming broom-shaped clusters; 

 spores spherical to oval. 



3. Streptomyces globisporus 



b. Aerial mycelium whitish to light gray, in concentric zones. 



4. Streptomyces annulatus 



c. Aerial mycelium on synthetic sucrose agar sandy lavender 

 to dark gray. 



5. Streptomyces rochet 



2. Aerial mycelium gray to blue-gray; soluble pigment blue, 

 a. Strongly proteolytic. 

 a 1 . Spirals formed. 



a 2 . Pigment at first red, changing to blue. 



6. Streptomyces coelicolor. 



