PROSPECTS FOR A NATURAL SYSTEM OF CLASSIFICATION OF BACTERIA 



Chemo-heterotrophic, fermenting carbohydrates with the formation of lactic 

 and acetic acid, ethyl alcohol and carbon dioxide. Gram-positive. 

 The type species is Betacoccus arabinosaceus Orla-Jensen. 



VIII. Tribe Corynebacterieae 



i. Corymb acterium Lehmann et Neumann, 1896. Emend. (!). 



Cells ovoid to rod-shaped, the latter frequently swollen or branched. Immotile. 

 No endospores formed. Chemo-heterotrophic, oxidizing various organic com- 

 pounds. Gram-positive. 

 The type species is Coryneb acterium pseudodiphtheriticum Lehmann et Neumann. 



2. Fusiformis Hoelling, 1910. Emend. (!). 



Cells ovoid, frequently elongate and fusiform, filaments sometimes formed. Im- 

 motile. No endospores formed. Chemo-heterotrophic, fermenting protein de- 

 composition products (?). Gram-positive (?). 

 The type species is Fusiformis dentium Hoelling. 



3. Propionibacterium Orla-Jensen, 1909. 



Cells ovoid to rod-shaped, the latter frequently swollen or branched. Immotile. 

 No endospores formed. Chemo-heterotrophic, fermenting carbohydrates with 

 the formation of propionic acid as the main product. Gram-positive. 

 The type species is Propionibacterium jensenii Van Niel. 



4. Streptob acterium Orla-Jensen, 1919. 



Cells ovoid to rod-shaped, frequently in chains. Immotile. No endospores 

 formed. Chemo-heterotrophic, fermenting carbohydrates with the practically 

 exclusive formation of lactic acid. Gram-positive. 

 The type species is Streptobacterium casei Orla-Jensen. 



5. Betab acterium Orla-Jensen, 19 19. 



Cells ovoid to rod-shaped, frequently in chains. Immotile. No endospores 

 formed. Chemo-heterotrophic, fermenting carbohydrates with the formation 

 of lactic and acetic acid, ethyl alcohol and carbon dioxide. Gram-positive. 

 The type species is Betabacterium breve Orla-Jensen. 



IX. Tribe Mycobacterieae 



1. Mycobacterium Lehmann et Neumann, 1896. 



Rod-shaped bacteria, with a marked tendency to the formation of branched 

 and filamentous cells. No endospores formed. Chemo-heterotrophic, oxidizing 

 various organic compounds. Gram-positive, acid-fast. 

 The type species is Mycobacterium tuberculosis (Koch) Lehmann et Neumann. 



2. Ther mob acterium Orla-Jensen, 19 19. 



Rod-shaped bacteria, with a tendency to the formation of filamentous cells. 

 No endospores formed. Chemo-heterotrophic, fermenting carbohydrates with 

 the practically exclusive formation of lactic acid. Gram-positive. 

 The type species is Thermobacterium cereale Orla-Jensen. 



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