THE CLASSIFICATION OF BACTERIA 367 



13. Streptothrix rubra Kruse 



Fliigge, Die Mikroorganismen, 1896, 63. 



Noted by Casab6 : Centralblatt f. Bakteriol, XVII, Nos. 13-14, 1895. 



Morphology. Thick-branched filaments with spores. A good growth under 

 anaerobic conditions with the formation of brick-red colonies. Non- 

 pathogenic. 



Habitat. Isolated from sputum. 



14. Streptothrix farcinica 



Bacillus du Farcin Nocard : Ann. Pasteur Inst., II, 1888, 293, 

 Nocardia farcinica Trevisan ; Genera, 1889, 9. 

 Streptothrix farcinica Rossi-Doria: l.c., 1891. 



Morphology.. Filaments 0.25 ju, thick, branched, or short jointed. Stain by 

 Gram's method. Slight growth at 20°, good growth at 37°. 



Gelatin colonies. Grow slowly ; in 10 days small round transparent glisten- 

 ing spheres which microscopically are entire, grayish, and amorphous. 



Gelatin stab. In depth, growth granular; on the surface a slow growth, 

 which in 12 days is white and warty. 



Agar colonies. Yellowish white, irregular, glistening, membranous, 1-2 mm. 



Agar slant. Growth grayish — yellowish white, with a rough, finely cleft 

 surface. 



Bouillon. Clear, with a granular sediment and often a dirty gray membrane. 



Milk. Not coagulated, reaction unchanged. 



Potato. Slow growth, whitish yellow, dull ; surface squamose. 



Pathogenesis. Intraperitoneal inoculation of guinea pigs causes in 9-20 days a 

 pseudotuberculosis of the abdominal viscera, with the fungus within the 

 tubercles. By subcutaneous inoculation only an affection at the point of 

 inoculation or neighboring lymph glands. Intravenous inoculations of 

 cattle and sheep cause a slowly progressive pseudotuberculosis. 



Habitat. Associated with a chronic form of tuberculosis in the subcutis of the 

 intestines and of the internal organs. 



15. Streptothrix aurantiaca Rossi-Doria 



I.e., 1891. 



Morphology. Branched filaments with aerial hyphse and spores. Grows at 



20°, but not with the exclusion of air. 

 Gelatin colonies. Waxy, yellow, becoming orange, with a whitish bloom ; 



surface colonies not colored. 



