GENERAL SYSTEMATIC BACTERIOLOGY 75 



II. Cells in vegetative stage forming a pseudoplasmodium. 



Family IV. Myxobacteriaceae 

 B. Cells in filaments, frequently sheathed. 



Order II. Desmobacterineae 

 One family only Family VII. Desmobacteriaceae 



While no new genera are described, a larger number of genera are 

 included in several of the families than by most other writers. 



Engler (1912) in the seventh edition of his syllabus gives the fol- 

 lowing outline of bacterial classification: 



Engler's Classification of Bacteria (1912) 



Schizomycetes 

 I, Order Eubacteria. Cells without sulfur and bacteriopurpurin: 



A. Family, Bacteriaceae: Cells very small, cylindric, straight or slightly 



bent: 



1. Without flagella Bacterium 



2. With flagella: 



a. Peritrichous Bacillus 



h. Polar Pse\ido7nonas 



B. Family, Spirillaceae: Spiral cells: 



1. Cells stiff, not serpentine: 



a. Non-motile Spirosoma 



h. Motile: 



(1) With 1, 2, or 3 polar flagella. 



Microspira 



(2) With bunch of polar flagella. 



Spirillmn 



2. Cells serpentine Spirochaete 



C. Family, Phycobacteriaceae: {Chlamydobacteriaceae) Filamentous, sur- 



rounded by a more or less definite sheath and dividing seldom in 

 three directions. Multiplication by conidia. 



Genera: Phragmidiothrix, Chlamydothrix, Gallionella, Crenothrix, 

 Clonothrix, Sphaerotilus (Cladothrix) . 



D. Family, Actinomycetaceae : Filamentous colonies with true branching, 



radiating, non-motile. Filaments dividing up into oidia. 

 One genus Actinomyces 



E. Family, Coccaceae: Cells spherical: 



Genera, Streptococcus, Micrococcus, Leuconostoc, Sarcina, Azotobacter, 

 Planococcus. 



F. Family, Myxobacteriaceae: Cells more or less rod shaped, non-flagellate, 



with slimy membrane, moving slowly forward (Pseudoplasmodia) 

 which become a cyst, sessile or stalked. 

 Genera: Polyangium, Chondromyces, Myxococcus. 

 II. Order, Thiobacteria: Cells with sulfur inclusions, colorless or red or violet 

 with bacteriopurpurin. 



