176 GENERAL SYSTEMATIC BACTERIOLOGY 



4/t long by 1.7m), and A. granula (cells spherical, exceedingly small — scarcely 

 0.5m in diameter). 



Bergey et al. (1923, p. 398) followed Buchanan. 



Orla-Jensen (1909, p. 334) proposed that Amoebohacter be replaced 

 by a new term Amoehomonas. 



Apparently no author has studied the organisms of this genus since 

 Winogradsky's original description. 



Amoebobactereae. A variant spelling of Amoehobaderieae used 

 by Bergey et al. (1923, p. 398) for the fourth tribe of the subfamily 

 Chromatioideae with the description: "Sulphur bacteria in which the 

 cells are united into families. Cell division occurring only in one direc- 

 tion of space." 



One genus only, Amoebobacter is included. 



Amoebobacteriaceae. A subfamily of the family Rhodobaderia- 

 ceae of the sulphur bacteria established by Migula (1900, p. 1045) 

 to contain the genera Amoebobader, Thiodidyon, Thiothece, and Thio- 

 polycoccus. 



This subfamily is characterized by having the cells united into fam- 

 ilies, cell division occurring in one direction of space. It has generally 

 been recognized by subsequent authors dealing with this group, as 

 Migula (1904, p. 146), Erwin F. Smith (1905, p. 163), Frost (1911, p. 61). 



Article 23 of the International Rules for Botanical Nomenclature 

 would require the change of the subfamily name to Amoebobaderioideae. 



Amoebobacterieae. A subtribe of the tribe Ascococceae Trevisan 

 (1889, p. 1043) established by Trevisan, to include the single genus 

 Amoebobader. The diagnosis given is "Cocci in muco matricali in 

 series filamentosas laze conjundi. Cystides universales tenuissimae, 

 cito dilabentes. Cystides speciales nullae.'' 



The International Rules of Botanical Nomenclature (Article 23) 

 would require the change of this name if used for designation of a 

 subtribe to Amoebobaderinae. 



The same name was used by Buchanan (1918, p. 469) to designate a 

 tribe with the following diagnosis " Sulphur bacteria in which the cells 

 are united into families. Cell division occurring only in one direction 

 of space. " Four genera were included Amoebobacter, Thiodidyon, Thio- 

 thece and Thiopoly coccus. Bergey et al. (1923, p. 398) used the spelling 

 Amoebobactereae g.v. 



Amoebomonas. A name proposed by Orla-Jensen (1909, p. 334) to 

 replace the generic name Amoebobacter, Winogradsky of the Rhodo- 



