THE CLASSIFICATION OF BACTERIA 349 



MYCOBACTERIACEjE 



Cells either short or long, cylindrical clavate cuneate in form, which at 

 times may show true branching, or as long-branched mycelial-like fila- 

 ments. Filaments not surrounded by a sheath as in Chlamydobacteriacea. 

 Without endospores, but with the formation of gonidia-like bodies due to 

 a segmentation of the cells. Division at right angles to the axis of a rod 

 or filament. 



A. Cells in their ordinary form short cylindrical rods, often bent and 

 irregularly swollen, clavate or cuneate. At times Y-shaped forms 

 or longer filaments with true branchings. May produce short coccoid 

 elements, perhaps gonidia Mycobacterium (Lehmann-Neumann), 

 including Corynebacterium (Lehmann-Neumann). 



B. Cells in their ordinary form as long-branched filaments. Produce 

 gonidia-like bodies. Cultures generally have a mouldy appearance 

 due to the development of aerial hyphae. Streptothrix (Cohn) ; 

 Oospora (Lehmann-Neumann). 



MYCOBACTERIUM Lehmann-Neumann 



Characters emend, including Corynebacterium Lehmann-Neumann: Bak. Diag., 1896. 



Cells in their ordinary forms as short cylindrical rods, which are often bent 

 irregularly, swollen, clavate or cuneate, and which also at times may show 

 Y-shaped forms or longer filaments, with true branchings. Without endo- 

 spores. Without flagella. May produce short coccoid elements, perhaps 

 gonidia. 

 I. Stain with aqueous solutions of basic aniline colors, and are easily decolor- 

 ized by mineral acids when stained with ZiehFs carbol fuchsin. 

 A. Cells slender, straight or bent, generally cylindrical, rod-like ; rarely 

 show branched forms. 

 1. Do not grow on ordinary nutrient gelatin. 



a. Have not been cultivated on any known artificial media. 



1. Mycobact. lepra (Hansen) Lehmann-Neumann. 



2. Mycobact. syphilidis (Schrbter). 



b. Grow only on special blood media. 



3. Mycobact. influenza (Pfeiffer). INFLUENZA GROUP. 



4. Mycobact. E/wassian. 



