THE CLASSIFICATION OF BACTERIA 365 



8. Streptothrix invulnerabilis (Acosta-Grande-Rossi) Kruse 



Cladothrix invulnerabilis Acosta-Grande-Rossi : Centralblatt f. Bakteriol., XV, 1893, 1. 

 Streptothrix invulnerabilis Kruse : Fliigge, Die Mikroorganismen, 1896, 64. 



Morphology. Mycelium branched with aerial hyphae. 



Gelatin colonies. Tough, with a whitish bloom, crumpled ; gelatin not 



liquefied. Grows in the absence of air. 

 Potato.. Stained black around the growth. Causes a cloudiness in water. 

 Habitat. Water, etc. 



9. Streptothrix Foersteri Cohn 



Streptothrix Foersteri Cohn: Beitrage Biol., Bd. I, Heft. 3. 

 Streptothrix alba Rossi-Doria: Annal. dell' 1st. d' Ig. di Roma, 1891. 

 Streptothrix /-// Almquist : Zeitsch. f. Hygiene, VIII, 1890. 

 Actinomyces albus Gasperini: Ann. Micrographie, IX, 1890, 449. 

 Cladothrix liquefaciens Hesse-Garten: Zeitsch. f. Chirurgie, 34 and 41. 



Morphology. A branched mycelium with abundant aerial hyphae, giving 



cultures a white appearance. Aerobic. 

 On gelatin, a broadly folded membrane with a white bloom and oil drops. 

 Milk. Peptonized. Grows well on cooked vegetables. 

 Pathogenesis. Non-pathogenic (Rossi-Doria). According to Gasperini, may 



produce actinomyces in cattle. Almquist found this species in a case of 



meningitis. 

 Cladothrix liquefaciens of Hesse-Gartner was isolated from a lesion in man, 



simulating actinomycosis. The various forms classed under this head 



are not sufficiently described to closely differentiate them. 

 Habitat. Air and water ; also assuming pathogenic roles as already intimated. 



10. Streptothrix albido Rossi-Doria 



Annal. dell' 1st. d' Ig. di Roma, 1891. 



Morphology. Mycelium branched, with aerial hyphae sparingly. Do not 

 grow with the exclusion of air. Color of colonies yellowish. Surface 

 growth channelled or fluted. Gelatin liquefied slowly. 



Milk. Growth as islands on the surface, peptonized. Non-pathogenic. 



Habitat. Air. 



11. Streptothrix chromogena Gasperini 



Streptothrix nigra Rossi-Doria : I.e., 1891. 



Morphology . Branched filaments often evidently septate, composed of long 

 and short elements. In the aerial hyphae by segmentation short coccoid 



