GENERAL SYSTEMATIC BACTERIOLOGY 101 



Key to the Orders of the Bacteria. Heller (1921) 



Simple, one-celled plants that multiply typically by binary fission and occa- 

 sionally by budding. They show no form of sexual multiplication. They rarely 

 contain cellulose and do not contain chlorophyll or phycocyanin. 



Phylum 1. Bacteria 



A, Bacteria which do not form a complex fruiting body. 



Class I. Eubacterieae 

 Eubacterieae whose cells are never in sheathed filaments. Conidia not observed. 

 Free iron sulphur or bacteriopurpurin never present. Multiplication always 



occurs by transverse fission Order I. Eubacteriales 



Sulphur bacteria Order II. Thiobacteriales 



Iron and manganese bacteria. . .Order III. Chlamydobacteriales 



B. Bacteria which join to form a complex fruiting body. 



Class II. Myxobacterieae 



She also added to the "Committee's" Hst of famiHes of the Eubacte- 

 riales, the Clostridiaceae: with two subfamihes, the Clostridioideae 

 and Putrificoideae. A key to the genera of the Clostridioideae was 

 later (1922, p. 5) pubHshed as follows: 



Key to the Genera of the Subfamily Clostridioideae. Heller (1922) 



A. Do not produce H2S demonstrable by lead-acetate-paper test were grown 

 in blood-broth 

 B. Do not liquefy gelatin. 



C. Very large rods that form oval spores and store up starch in car- 

 bohydrate media Genus 1. Clostridium Prazmowski 



emend. Heller. Type species bu- 

 tyricum as described by Winogradsky 

 (1895). 

 CC. Rods with spherical spores. 



D. Do not grow on media containing much protein. 



Genus. 2. Omelianskillus . nov. gen. 

 Type species hydrogenicus as described 

 by Omeliansky (1895 and 1904b). 

 DD. Grow on ordinary anaerobe media. 



E. Sides of the bacilli parallel, spores strictly terminal. 



Genus 3. Macintoshillus nov. gen. 

 Type species tetanomorphus (pseu- 

 dotetanus bacillus, Mcintosh (p. 32), 

 Bacillus tetanomorphus Committee (p. 

 41), as described by the Committee. 

 EE. Spores not always strictly terminal, sides of bacilli 

 may not be parallel. 



Genus 4. Douglasillus nov. gen. Type 

 species sphenoides (Bacillus sphen- 

 oides Douglas, Fleming and Cole- 

 brook), as described by the Com- 

 mittee (p. 43). 



