Waksman — 14 — Actinomycetes 



2. Non-acid-fast organisms Corynehacterium. 



II. Mycelium formed Proactinomyces. 



B. Spores formed Actinomycetaceae. 



I. Spores in aerial mycelium Actinomyces. 



II. Spores terminally on branches of vegetative mycelium 



Micronionos'pora. 



J. Classifcation of Dnche (1934): 



This classification, like that of C and D, was based largely upon the cultural 

 characteristics of the organisms, and like D, was limited to the conidia-pro- 

 ducing aerobic types, especially of the alhiis group. 

 I. Vigorously growing form.s. 



1. Mycelium yellowish, no exopigment. Species included in this 

 group, based on pigmentation of the mycelium, were A. alhus, A. 

 alboviridis, A. roseiis, A. halstedii, A. ■parvus, A. lavendulae. 



2. Mycelium yellowish, exopigment not very intense. Descriptions 

 based on soluble pigment, such as A. viridis, A. flavogriseus, etc. 



3. Mycelium black, no exopigment, white efflorescence. . . A. reticuli. 



4. Mycelium yellow-red, no exopigment, white efflorescence 



A. alhosforeus. 



5. Mycelium yellowish-clear, no exopigment, yellow efflorescence 



A. citreus. 

 II. Non-vigorously growing forms: 



1. Mycelium yellowish, no exopigment, poor yellowish efflorescence.. . 



A. almquisti. 



K. Classification of Krassilnikov (1938): 



I. Actinomycetaceae. 



1. Nonseptate mycelium, not breaking into rods Actinom.yces. 



2. Unicellular mycelium, later breaking into rods and cocci 



Proactinomyces. 



3. No mycelium, elongated rod-shaped, branching and breaking into 

 coccoid forms Mycobacterium. 



4. Cells coccus-like, seldom rod-shaped; resting cells develop in a manner 

 similar to actinomyces spores Mycococcus. 



II. Micromonosporaceae. 



Mycelium well developed; conidia produced singly on short conidiophores. 



Micromonospora. 



L. Classification of Baldacci (1939): 



I. Filamentous, often producing two types of mycelium; no conidia formed; 



cells rod-shaped or coccoid; usually parasitic Mycobacteriaceae. 



1. Rod-like organisms, rarely filamentous forms Leptotrichioideae. 



a. Thin, occasional mycelial hyphae, gram-negative. 



a\ Cells fusiform Ftisiformis. 



W. Cells rod-shaped or coccus-like ActinobaciUus. 



c\ Cells rod-shaped, sometimes filamentous; branched. Pfeifferella. 



b. Hyphae frequently present, gram-positive. 



a\ Filaments branched, thickened, showing characteristic granules. 



Erysipelothrix. 



