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GENERAL SYSTEMATIC BACTERIOLOGY 



Hansgirg's Comparison of Bacteria and Blue-green Algae (1888) 



Bacteria Blue Green Algae 



Micrococcus-Hyalococcus A phanocapsa-Chrococcus 



Bacterium-Streptococcus A phanothece-Synechococcus 



Leucocystis-Mycothece Gloeocapsa-Gloeathece 



Ascococcus-Leuconosloc Polycoccus-Anacystis (Polycystis) 



Lamprocystis {Cohnia)-Sarcina . Clathrocystis-Merismopedium 



{Lampropedia) Lyngbya exp. {Leptothrix exp. Hypheo- 

 Bacillus-Leptothrix exp. thrix) 



Beggiatoa-Spirochaete (Spirillum) Oscillaria-Spirulina 



Myconostoc Nostoc 



Crenothrix Chamaesiphon 



Cladothrix (Streptothrix) Plectonema [Glaucothrix) 



He also prepared an outline of the groups of bacteria with particular 

 reference to the forms to be found in damp cellars and other subterranean 

 habitats. While adequate descriptions are not given by Hansgirg, 

 the following key is believed to represent the principal distinctions among 

 the various groups. 



Hansgirg's Classification of Bacteria (Schizomycetes) (1888) 



A. Filamentous Order I. Desmobacteria 



I. With false branching. . . .Family Cladothricaceae 



One genus only Genus Cladothrix Cohn 



II. No false branching. 



a. Gonidia formed Family Crenothricaceae Hansg. 



One genus only Genus Crenothrix Cohn 



b. No gonidia Family Leptothricaceae 



1. Filaments immobile. 



Subfamily Leptothriceae 

 One genus only. . . .Genus Leptothrix Ktz. ex. p. 



2. Filaments oscillating. 



Subfamily Beggiatoeae Hansg. 

 One genus only Genus Beggiatoa Trevisan 



(a) Filaments not colored. 



Sec. 1. Eubeggiatoa Hansg. 



(b) Filaments colored purple. 



Sec. 2. Chromobeggiatoa Hansg. 



B. Cells elongate, but not filamentous. 



Order II. Euhacteria 



I. Cells not encysted Family Bacteriaceae 



a. Cells spirally bent. ..Subfamily Spirobacteria. Cohn 



1. Cells flexuous Genus Spirochaete. Ehrb. 



2. Cells not flexuous. . .Genus Spirillum Ehrb. 



(a) Colorless, without sulphur. 



Section 1. Vibrio (Cohn) Hansg. 



(b) Rose colored, with sulphur. 



