THE CLASSIFICATION OF BACTERIA 373 



£. Not as above specified. Grow more or less readily on culture media. 



1. Gelatin liquefied. 



a. Growth on gelatin or agar pinkish — reddish. 



3. Cladothrix rufula Wri^i. 



b. Growth on gelatin whitish. 



* Gelatin stained brownish by the growth of the organism. 



4. Cladothrix dichotoma Cohn. 



5 . Cladothrix profundus Ravenel. 



6. Cladothrix intestinalis Ravenel. 

 ** Gelatin not stained brownish. 



t Colonies on agar distinctly stellate in form. 



7. Cladothrix invulnerabilis Acosta-Grande-Rossi. 

 tt Colonies on gelatin floccose — filamentous. 



8. Cladothrix fungiforinis Ravenel. 



9. Cladothrix intrica Russell. 



2. Gelatin not liquefied. 



10. Cladothrix non-liquefaciens Ravenel. 



I. Cladothrix natans (Kutzing) Migula 



SphceroHlus natans Kutzing: Linnsea. VIII, 1833, 385. 



Cladothrix natans Migula: Die Natiirlichen Pflanzenfam., 1895, 46. 



Filaments composed of rod-like elements, surrounded by a thick gelatinous 

 sheath. Show false branching like Cladothrix dichotoma. Eventually 

 round strongly refracting bodies form within the rods, which germinate 

 either outside or within the mother cells. 



-Habitat. Found as slimy particles in factory water. 



2. Cladothrix ochracea (Kiitzing) Winogradsky 



Leptothrix'ockracea Kutzing: Species Algarum, 147. 

 Cladothrix ochracea Winogradsky. 



In morphology like Cladothrix dichotoma ; distinguished from the latter by the 

 accumulation in the sheath of hydrated oxide of iron. Does not grow in 

 ordinary culture media. 



3. Cladothrix rufula Wright 



l-c, 433- 

 Filaments long slender branched, which in stained preparations are seen to 

 be composed of rather long undulate segments, separated by a clear 

 interval. In the mature condition, deeply stained bodies of a diameter 

 2-3 times the width of the filament are seen. 



