STUDIES IN THE CLASSIFICATION AND 

 NOMENCLATURE OF THE BACTERIA 



X. SUBGROUPS AND GENERA OF THE MYXOBACTERIALES 

 AND SPIROCHAETALES 



R. E. BUCHANAN 



From the Bacteriological Laboratories of the Iowa State College 



Received for publication, October 22, 1916 



Order V. Myxobacteriales. Ordo nov. 



Motile, rod-like organisms, multiplying by fission, secreting a 

 gelatinous base, and forming a pseudoplasmodium-like aggregation 

 before passing into a more or less highly developed cyst-producing, 

 resting state m which the rods may become encysted in groups without 

 modification, or may be converted into spore masses. 



There is one family only, the Myxobacteriaceae. 



Family I. Myxobacteriaceae Thaxter, 1892, p. 394 



Characters those of the order. 



The following generic names have been used for organisms of 

 this group. 



Polyangium Link, 1795 



Stigmatella Berkeley and Curtiss, 1857, p. 70 



Chondromyces Berkeley and Curtiss, 1857, p. 313 



Cystobacter Schroeter, 1886, p. 170 



Myxobacter Thaxter, 1892, p. 403 



Myxococcus Thaxter, 1892, p. 403 



Myxobotrys Zukal, 1896, p. 346 

 The genera may be differentiated by the following key : 



Key to the genera of Myxobacteriaceae 



I. Cells not transformed into coccus-like spores when encysted. 



A. Rods forming free cysts in which they remain unmodified. Cysts vari- 

 ous, sessile or borne on a more or less highly developed cystophore. 



Genus I. Chondromyces 



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