506 GENERAL SYSTEMATIC BACTERIOLOGY 



Orla-Jensen (1909, p. 334) incorrectly termed this genus a synonym 

 of Rhodidictyon. Buchanan (1918, p. 469) included this as the second 

 genus of the tribe Amoebobaderieae with the following description. 



Cells rod-shaped or spindle-shaped, with sharply pointed ends, united into a 

 net. The compact mass of rods finally assumes an appearance like that of 

 Hydrodictyon. Slight violet color. 

 The type species is Thiodictyon elegans Winogradsky. 



Bergey et al. (1923, p. 399) used the same description. 



Thiomonas. A genus of sulphur bacteria belonging to the Thio- 

 bacteriaceae named by Orla-Jensen (1909, p. 330). The organisms 

 are not autotrophic, cells rod shaped, not spiral. The organisms 

 described by Hinze (1903, p. 309) and Jegunow (1896, p. 11) are as- 

 signed to this genus. 



Thiopedia. A genus name used by Winogradsky (1888, p. 85) 

 to include Merismopedia-\ike organisms with bacterio-purpurin and 

 sulphur granules. The species described is Th. rosea. De Toni and 

 Trevisan (1889, p. 1048) regard this as a synonym of Lampropedia 

 Schroeter. The genus is discussed by Migula (1900, p. 1045) (1904, 

 p. 146), E. F. Smith (1905, p. 163) and Frost (1911, p. 61). Smith 

 gives the following description of the genus: "Families tabular, formed 

 of cells arranged in fours, and capable of swarming." 



Orla-Jensen (1909, p. 334) incorrectly makes this the genus Rhodo- 



COCCUSi. 



It seems that Lampropedia has priority over Thiopedia. 



Thiopediaceae. A subfamily name used by Migula (1900, p. 1044) 

 to include those sulphur bacteria in which the cells are united into 

 families and cell division is in two directions of space. The only genus 

 is Thiopedia Winogradsky. The subfamily is recognized by Smith 

 (1905, p. 163) and Frost (1911, p. 61). 



Thiopedieae. The third tribe of the subfamily Chromatioideae as 

 named by Buchanan (1918, p. 468) with the description: "Sulphur 

 bacteria in which the cells are united into families, and cell division is 

 in two directions of space, resulting in the development of plates of 

 ceUs." 



The genera included are Lamjjropedia and Thioderma. 



Bergey etal. (1923, p. 397) use the same description. 



This destignation probably should be changed to Lampropedieae, 

 as the tribe does not contain a valid genus Thiopedia. 



Thiophysa. A generic name given by Hinze (1903, p. 310) to a 

 sulphur bacterium from the Bay of Naples. 



