SUBGROUPS AND GENERA OF THE THIOBACTERIALES 465 



Cohnia Winter, 1884, p. 48 

 Lamprocystis Schroeter, 1886, p. 151 

 Lampropedia Schroeter, 1886, p. 151 

 Mycothece Hansgirg, 1888, p. 266 

 Amoehobacter Winogradsky, 1888, p. 71 

 Thiocapsa Winogradsky, 1888, p. 84 



Thiocystis Winogradsky, 1888, p. 60 



Thiodictyon Winogradsky, 1888, p. 80 



Thiopedia Winogradsky, 1888, p. 85 



Thiopoly coccus Winogradsky, 1888, p. 79 



Thiosarcina Winogradsky, 1888, p. 104 



Thiospirillum Winogradsky, 1888, p. 104 



Thiothece Winogradsky, 1888, p. 82 



Cenomesia De Toni and Trevisan, 1889, p. 1039 



Thiosphaerion Miyoshi, 1897, p. 170 

 • Thiosphaera Miyoshi, 1897, p. 170 



Rhodocapsa Mohsch, 1906, p. 223 



Rhodothece Mohsch, 1906, p. 223 



Amoebomonas Jensen, 1909, p. 338 



Thioder7na Miyoshi, 1897, p. 170 



Rhabdochromatium Winogradsky, 1888, p. 100 



Of these names Clathrocystis and Erythroconis are algal genera 

 to which certain of the sulphur bacteria have at different times 

 been assigned. 



Following is a key to the tribes of the Chromatioideae which 

 may be recognized largely from the descriptions of Winogradsky. 



Key to the tribes of Chromatioideae 



A Cells united, at least during a part of the life history, into families. 



I Cell division such that masses of cells, not merely plates, are formed. 



a. Cell division in three directions of space Tribe I. Thiocapseae 



b. Cell division first in three, then in two directions of space. 



Tribe II. Lamprocijsteae 



II Cell division in two planes, forming plates of cells. 



Tribe III. Thiopedieae 



III Cell division in one plane Tribe IV. Amoebobacterieae 



B. Cells free, capable of swarming at any time Tribe V. Chro^natieae 



THE JOURNAL OF BACTKRIOLOQY, VOL. Ill, NO. 5 



