CLASSIFICATION OF BACTERIA III 



Genus: Sphaerotilus Kiitzing, 1833 (Cladothrix Cohn). 



The cells are cylindrical and the threads are surrounded by 

 sheaths. Dichotomous branching is present, and there is no 

 differentiation in size between the apex and base of the thread. 

 Reproduction takes place by means of gonidia which swarm 

 together within the cell. These gonidia burst out of the 

 cells, attach themselves to some object, and grow into new 

 threads. The gonidia are endowed with flagella which are 

 attached toward the end and below the pole. 



II. ORDER THIOBACTERIA (Sulphur Bacteria). 



The cells do not possess any nucleus and contain sulphur. 

 The cells are colorless or pigmented rose, violet, or red by 

 bacteriopurpurin. The cells are never pigmented green. 



I. Family : Beggiatoaceae Trevisan. 



Filamentous bacteria which do not contain bacteriopurpurin. 

 The cells contain sulphur granules. Reproduction takes place 

 in one direction of space. 



Genus : Thiothrix Winogradsky. 



The cells are nonmotile and the threads are attached to 

 some object. The threads are surrounded by a delicate 

 sheath and the cells contain sulphur granules. Gonidia are 

 produced at the end of the threads. These gonidia are 

 motile and finally attach themselves to some object, and, 



