70 GENERAL SYSTEMATIC BACTERIOLOGY 



1. Not typically water forms. Cells tending to branch and to form 



branching hyphae. Not forming filaments usually. 

 Family 2. Actinomycetes 



2. Typically water forms. Cells not tending to form mycelium. 



Typically filamentous. 



Family 5. Trichobacteriaceae 

 II. Cells spherical or rod shaped, never spiral. Either peritrichous or non- 

 motile. Not typically the water bacteria. Do not secure growth energy 

 solely by oxidative processes. 



Order II. Peritrichinae 



A. Typically not obligate anaerobic or microaerophilic. 



1. Usually bringing about transformation in carbohydrates with the 



development of acids. 



Family 1. Acidobacteriaceae 



2. Usually bringing about an alkaline reaction by the development 



of ammonia Family 2. Alkalibacteriaceae 



B. Typically obligate anaerobic or microaerophilic. 



1. Acting largely upon carbohydrates, developing acids, particularly 



butyric acid Family 3. Butyribacteriaceae 



2. Acting largely upon proteins, bringing about putrefactive changes. 



Family 4. Putribacieriaceae 



Order I. Cephalotrichinae 



Key to the Genera of Family I. Oxydobacteriaceae 



I. Not oxidizing nitrogen compounds nor fixing free nitrogen: 



A. Oxidizing methane to CO2 and H2O Mcthanomonas 



B. Oxidizing CO to CO2 Carboxydomonas 



C. Oxidizing H2 to H2O Hydrogenomonas 



D. Oxidizing alcohol to acetic acid Acetimonas 



II. Oxidizing ammonia or nitrites: 



A. Oxidizing ammonia Nitrosomonns 



B. Oxidizing nitrites Nitromonas 



III. Fixing atmospheric nitrogen Azotobacter 



Key to the Genera of Family II. Actinomycetes 



I. Not producing a much branched mycelium, individual cells only branching: 



A. Symbiotic in the nodules of legumes Rhizomonas 



B. Not symbiotic. Parasites in mammals: 



1. Not acid fast Corynemonas 



2. Acid fast Mycomonas 



II. Producing a much branched mycelium Actinomyces 



Key to the genera of Family III. Thiobacteriaceae 



I. Cells not spiral: 



A. Cells rod-shaped, or not spherical: 



1. Autotrophic, rod-shaped Sidphomonas 



2. Not autotrophic, oval (?) Thiomonas 



