CLASS SCHIZOMYCETES 45 



THE CLASSIFICATION OF SERGEY'S MANUAL OF 

 DETERMINATIVE BACTERIOLOGY.^ 



While there are many things in this Manual of Bergey's 

 which need revision, it is nevertheless true that at present it is 

 the best readily available source of descriptive bacteriology in 

 this country. No attempt will be made to include all its 

 details, but is is believed that an outline of the families and 

 genera and a brief key will be helpful to the student. The 

 summary is adapted from the Journal of Bacteriology, vol. 

 xvi, No. 6, pp. 394-395— A Diagrammatic Summary of 

 Various Bacterial Classifications. A Report of the Committee 

 on Taxonomy (of the Society of American Bacteriologists). 

 R. E. Buchanan, Chairman, R. S. Breed, L. F. Rettger. 



CLASS SCHIZOMYCETES. 



Unicellular, non-chlorophyl-containing plants, reproducing by trans- 

 verse division, some higher forms also by conidia. 



Key to the Orders. 



1. Simple, undifferentiated forms without 



true branching. Sulphur and iron not 



stored as visible particles .... I. Euhaderiales 



2. Specialized or differentiated forms, some 



show true branching, 

 a Not protozoan like 



b Mold Hke II. Adinomycetales 



bb Not mold like 



c Sheathed .... III. Chlamijdohacteriales 

 cc Not sheathed 



d Sulphur bacteria IV. Thiohacteriales 

 dd Shme mold like . V. Myxobacteriales 

 aa Protozoan like, spiral .... VI. SpirochcBtales 



Key to the Families of the Order Eubacteriales. 



1. Secure energy by oxidizing simple com- 



pounds of C-S-N-H, sometimes by 

 oxidizing the elements S-H; some fix 

 free N I. Nitrohacteriacece 



2. Do not secure energy as above. 



a Cells spherical II. Coccacece 



aa Cells spiral III. SpirillacecB 



aaa Cells cyHndrical 



b Spores not formed . . . IV. Bacteriacece 



bb Spores formed .... V. Bacillaceoe 



1 Williams & Wilkins Company, Baltimore, 2d Edition, 1925. 



