SUBGROUPS AND GENERA OF THE BACTERIACEAE 43 



Fusiformis Hoelling, 1910, p. 240 



Thermobacterium Lindner 



Microbacillus Sabouraud 



Photobacter Beijerinck 



Ascobacillus Unna and Tommasoli, p. 60 



Among this list of generic names the following are based upon 

 species insufficiently described, and are disregarded here: Actino- 

 hacter, Astrobacter, Coccobacterium, Helicobacterium, Winograd- 

 skya, Zoogloea, Zygobacterium. 



The following have been termed physiological genera and 

 have usually been regarded as invalid: Halibacterium, Photo- 

 bctcter, Photobacterium, Lactobacter. 



The following generic names have not been included for other 

 reasons: Ascobacillus, Ascobacterium, Carboxydomonas, Oenobacil- 

 lus, Photobacterium, Methanomonas, Microbacillus. 



The following key gives the principal differential characters 

 of the sub tribes which are proposed: 



Key to the subtribes of the Bacterieae 



A. Cells usually fusiform Subtribe I. Fusiforminae 



B. Cells not fusiform. 



I. Requiring serum or hemoglobin for development. Obligate para- 

 sites. Gram-negative. Non-motile. .Subtribe II. Hemophilinae 

 II. Not requiring serum, or at least hemoglobin for development. 

 Gram-negative or positive. Motile or non-motile. 



a. Obligate aerobes, securing growth energy by oxidation 



of carbonaceous compounds, as carbohydrates, alcohols, 

 etc Subtribe III. Rhizobiinae 



b. Not obligate aerobes, not securing growth energy by oxida- 



tion of carbonaceous compounds, Subtribe IV. Bacteriinae. 



Subtribe I. Fusiforminae Subtrib. nov. 

 This tribe has a single genus, Fusiformis HoeUing. 



Genus I. Fusiformis Hoelling 1910, p. 240 



SynonyTQ : 



Mantegazzaea Vuillemin 1913, p. 521 

 not Mantegazzaea Trevisan 1879, p. 137 



