GENERAL SYSTEMATIC BACTERIOLOGY 515 



Samtliche Bakterien mochte ich zunachst in zwei Orduungen eintheilen, 

 die Haplobakterien, Einzelbakterien, und die Trichobakterien, Fadenbakterien. 

 Das unterscheidende Merkmal liegt in dem Bau des Vegetationskorpers, der bei 

 den Trichobakterien immer ein unverzweigter oder verzweigter aus einzelnen 

 aufgebauter Faden ist, wiihrend die Haplobakterien einen einzelligen Vegeta- 

 tionskorper besitzen, der kugelig, stabartig oder schraubig ist. Wenn bei den 

 Trichobakterien die Fiiden in ihre einzelnen Glieder zerfallen und diese zu- 

 schwarmen, so haben wir bier eine Fortpflanzungs erscheinung vor aus, die einzel- 

 nen Glieder werden zu Schwarmern, zu Gonidien. Der voUendet erwachsene 

 Trichobakterien "im Faden." 



The genera included are Crenothrix, Thiothrix, Cladoihrix and 

 Beggiatoa. 



The same family name was used by Orla-Jensen (1909, p. 303) 

 to designate the typically filamentous water bacteria showing no 

 tendency to the formation of a mycelium. The family is included 

 in the Cephalotrichinae, and includes the following genera, Cladothrix, 

 Leptothrix, Crenothrix, Spirochaeta, Spirophyllum, Beggiatoa and 

 Thiothrix. 



Trichobacterinae. An ordinal name used by Fischer (1897, p. 32) 

 for bacteria whose "vegetative phase consists of an unbranched or 

 branched filament or chain of cells, the individual members of which 

 break off as swarm spores (gonidia)." The order contains the single 

 famil}'^ Trichobacteriaceae. 



This name is also used by Schmidt and Weis (1902, p. 373) and by 

 Frost (1911, p. 59) as a name for a suborder. 



Trichobakterien. A variant (German) spelling of Trichobacteriaceae 

 used by Fischer (1895, p. 138) and others. 



Trichogenae. A sub-famil}- of Schizomycetaceae named b}- Trevisan 

 (1888). De Toni and Trevisan (1889, p. 924) give the following 

 diagnosis : 



Adsunt tres status evolutionis, h.e. filamenta (individua), baculi, cocci. Fila- 

 menta (status primarius, initialis seu archetj-pus) turn vaginata turn evaginata, 

 ut plurimum basi ab apice superiori distincta praedita. aiExa vel e puncto centrali 

 radiantia, rarius utrinque (apicibus conformibus) libera. Baculi et cocci in 

 filamentis inclusi. 



This subfamily together with Baculogenae and Coccogenae constitute 

 the family Schizomycetaceae. Trichogenae is divided into the following 

 tribes, Crenotriceae, Cladotriceae, Kurthieae and Leptotrichieae. 



Trichomycetes. A group name used by various writers to include 

 various genera of the thread bacteria, probably first by Petruschky 

 (1903). Jordan (1910, p. 411) gives the following discussion: 



