448 GENERAL SYSTEMATIC BACTERIOLOGY 



Rhodocystis. A name used by Molisch (1907, p. 22) to designate 

 a genus of bacteria characterized by the presence of bacteriopurpurin, 

 the absence of sulfur granules, the union of cells into families, the 

 division of cells in only one direction of space, the cells rod-shaped, 

 embedded in a common shmy capsule. One species Rhodocystis 

 gelatinosa is described. 



Orla-Jensen (1909, p. 334) proposed this name to replace Thiocystis. 

 In this sense it is probably invalid. 



Meyer (1912, p. 2) included this genus in his section Rhodohacillus 

 of the genus Bacillus. 



The genus was recognized by Buchanan (1918, p. 472) and the type 

 species designated as Rhodocystis gelatinosa Molisch. The descrip- 

 tion reads: "Cells rod-shaped, dividing in only one plane embedded 

 in a common slimy capsule." 



Rhododictyon. A generic name proposed by Orla-Jensen (1909, 

 p. 334) to replace the older name Thiodictyon Winogradsky, as the 

 third genus of the family Rhodohacteriaceae. It is probably to be 

 regarded as a synonym. 



Rhodomonas. A generic name proposed by Orla-Jensen (1909, 

 p. 33) to replace the older name Chromatium. It is included as the 

 first genus of the family Rhodohacteriaceae. It is probably an invalid 

 synonym. 



Rhodonostoc. A genus described by MoUsch (1907, p. 23) to in- 

 clude bacteria containing bacteriopurpurin without sulfur granules, 

 with cells united into famiUes, cells spherical or short rods, in chains 

 like a rosary and embedded in a common gelatinous capsule. One 

 species, Rhodonostoc capsulatum is included. 



It is recognized by Buchanan (1918, p. 472) with the designation of 

 Rhodonostoc capsulatum Molisch as type, and the description: "Cells 

 spherical or short rods, in rosary like chains, and embedded in a com- 

 mon gelatinous capsule." 



Bergey et al. (1923, p. 405) followed Buchanan. 



Rhodopolycoccus. A generic name proposed by Orla-Jensen (1909, 

 p. 334) to replace the older name Thiopoly coccus. It is included as 

 the sixth genus of his family Rhodohacteriaceae. It may be regarded 

 as a synonym of Thiopoly coccus. 



Rhodosarcina. A generic name used by Orla-Jensen (1909, p. 334) 

 to replace the older name Thiosarcina. It may be regarded as an 

 invahd synonym of this latter term. 



