114 MORPHOLOGY AND CULTURE OF MICROORGANISMS 



THE FAMILIES AND GENERA OF THE BACTERIA 



Report of the Committee of the Society of American Bacteriologists. C.-E. A. 

 Winslow et al. (Artificial key) 



ORDERS OF THE SCHIZOMYCETES 



Cells united during the vegetative stage into a 



pseudoplasmodium MYXOBACTERIALES 



Cells not forming a pseudoplasmodium 



Cells free or united in elongated filaments, often 

 with a well defined sheath. Conidia fre- 

 quently formed. Free sulphur, iron or 

 bacteriopurpurin often present. 

 Cells typically containing granules of sulphur or 



bacteriopurpurin or both THIOBACTERIALES 



Sidphur and bacteriopurpurin absent; iron often 



present CHLAMYDOBACTERIALES 



Cells necer in sheathed filaments. Conidia only 

 in mycelial Mycobacteriaceae. Flagella often 

 present. Free iron, sulphur, or bactiopurpurin 

 never present. EUBACTERIALES 



FAMILIES OF THE EUBACTERIALES 



Cells spiral with polar flagella IV. SPIRJLLACE^E 



Not as above 



Cells spherical; rarely, if ever, motile; spores 

 never produced; never securing growth energy 



from nitrogen or ammonia V. COCCACE^ 



Not as above 



Cells short rod-shaped with a single, rarely two, 

 polar flagellum; usually forming green or 



yellow pigment III. PSEUDOMONADACE^E 



Not wholly as above 



Spores formed VIII. BACILLACE/E 



Spores never formed 



Metabolism simple, securing growth energy 

 from carbon, hydrogen, or their simple 



compounds; flagella, if present, polar I. NITROBACTERIACE^: 



Metabolism complex, dependent upon more 

 complex carbohydrate and protein sub- 

 stances; flagella, if present, peritrichic. 

 Cells clubbed, fusiform, filamentous, 

 branching or mycelial; those not distinctly 

 so are either acid-fast or show barred 



irregular staining IT. MYCOBACTERIACE^ 



Not as above 



Gram positive; non-motile VI. LACTOBACILLACE^ 



Gram negative; often motile VI. BACTERIACE^: 



