Chapter I — B — Taxonomy 



Actinomyces and Nocardia, the cultures classitied in this system (D) art' 

 now included under the genus Streptomyces. 



E. Classification of Wollenxveher (1921): 



I. Weakly growing strains; aerial mycelium and conidia lacking 



Subgenus Pionnothrix. 

 This group included A. farcinicus, A. caprae, A. asteroides, A. poly 

 chromogenes, and A. pelletieri. 



II. More vigorously growing strains, producing aerial mycelium 



Subgenus Aerothiix. 



1. With sclerotial or spirodochial stroma Section Sclerostronni. 



This group included A. hovis, A. foersteri, A. scabies, and A. aeriiginew^. 



2. Sclerotial or spirodochial stroma not significant. 



a. With brown conidia Section Poliophaerospora. 



h. With light colored or colorless conidia Section Leucospora. 



a'. Substrate with variety of colors Subsection Heterochroma. 



a". With spiral conidial chains Series Helicothrix. 



b". Without spiral conidial chains Series Ahelicothrix. 



b'. Substrate with single color Subsection Monochromas. 



c. With reddish to red conidia Section Erythrinospora. 



d. With blue conidia Section Glaucospora- 



F. Classification of Langeron (1923): 



I. Aerobic forms Euactinoniyces. 



I. Forms parasitic to man and to animals Section Parasitica. 



a. Non-acid-fast, thin growth on solid media Majores. 



b. Acid-fast, tubercle-like growth on solid media Minoies. 



c. Forms difficult to cultivate, not growing on potato, not liquefying 

 gelatin or serum Breviores. 



II. Anaerobic forms Cohnistreptothrix. 



Facultative anaerobic forms, difficult to cultivate; no arthrospores pro- 

 duced. 



G. Classification of Orskov (1923): 



I. Typical conidia formation in aerial mycelium Cohnistreptothrix. 



II. Spore-formation by segmentation Actinomyces. 



III. Spores produced singly on branches of mycelium. . . . Micromonospora. 



H. Classification of Lignieres (1924): 



I. Aerobic, long mycelium, not breaking up into rods Actinomyces. 



II. Anaerobic, short mycelium, breaking up into long rods 



Brevistreptothrix. 

 III. No mycelium; cells rod-shaped Actinohacilhis. 



I. Classification of Jensen (1931): 



A. No spores formed Proactinomycetaceae. 



) I. No mycelium formed: 



1. Acid-fast organisms Mycobacterium. 



