92 Synopsis of the Bacteria and Yeast Fungi. 



DISPORA. 



III. D, Caucasia, Kern {Bot. Zeitung, xl., 1882, 

 p. 264). 



Cells resembling B. subtilis, 3'z-8 ft, long, '8 /t broad, 

 with a flagellum at each end. Forming long leptothrix 

 threads by growth and cell-division, and then producing 

 spores, which "stand on their ends," two in each cell. 

 Spores round, '8 ^ in diameter, afterwards increasing to i /x,. 



In " kephir," a drink prepared by the inhabitants of the 

 high-lying lands of the Caucasus, by fermentation of cows' 

 milk. (See Nature, 1882, p. 43, a.nd/our. Roy. Micr. Sac, 

 1882, p. 383.) 



This may be the result of mal-observation. In B. subtilis, when a 

 cell is elongated, and about to divide, two spores are sometimes found 

 in one cell. 



BEGGIATOA. 



112. B. nodosa, Van Tieghem (Bull. Soc. Bat. France, 

 1880, p. 176). 



Filaments colourless, very slender, motionless ; articula- 

 tions shorter than broad ; no sulphur granules. At intervals 

 some of the cells become more refringent, enlarge, and 

 persist like spores, and form nodosities on the filament. 

 Similar monstrosities exist, according to Van Tieghem, in 

 true Oscillarias. This is not a true Beggiatoa. 



PHRAGMIDIOTHRIX, Engler. 



Differs from Beggiatoa in the want of sulphur granules 

 and the continuous subdivision of the cells, and from 

 Crenothrix in the want of a sheath. 



