158 



SULPHUR BACTERIA 



T* • " V..' •' • V * 



Fig. 36. — Thioporphyra volutans (Ellis). 



Photomicrographs taken under the same magnification ( ■: 500) of the 



normal and the pleomorphic varieties of this organism. The change of form 



follows the change from reproduction by fission to reproduction by budding. 



(i) Normal form. The majority of the individuals are unicocci. At b 



. is shown a diplococcus, and at a n tricoccus. 

 (2) Pleomorphic variety. Large masses of small globules de^'eloped from 

 the normal form by budding. 



