SELECTED PAPERS 



2. Phaeomonas nov. gen. 



Ellipsoidal to rod-shaped bacteria, motile by means of cephalotrichous flagella. 



No endospores formed. Photo-heterotrophic, containing a brown pigment 



complex. 



The type species is Phaeomonas varians (Ewart), Syn.: Streptococcus varians Ewart. 



3. Rhodomonas Orla-Jensen, 1909. Emend . (!).* Syn.: Rhodobacillus Molisch, 

 1907. 



Ellipsoidal to rod-shaped bacteria, motile by means of cephalotrichous flagella. 

 No endospores formed. Photo-heterotrophic, containing a red to purple pig- 

 ment complex. 



The type species is Rhodomonas palustris (Molisch), Syn.: Rhodobacillus pahistris 

 Molisch. 



4. Sulfomonas nov. gen. Syn.: Thiobacillus Beijerinck, 1904. 



Ellipsoidal to rod-shaped bacteria, motile by means of cephalotrichous flagella. 



No endospores formed. Chemo-autotrophic, oxidizing ELS or other inorganic 



sulfur compounds. 



The type species is Sulfomonas thiopara (Beijerinck), Syn.: Thiobacillus thioparus 



Beijerinck. 



5. Sideromonas Cholodny, 1922. 



Ellipsoidal to rod-shaped bacteria, immotile (?). No endospores formed. 



Chemo-autotrophic, oxidizing ferrous iron. 



The type species is Sideromonas confervara Cholodny. 



6. Nitrosomonas Winogradsky, 1892. 



Ellipsoidal to rod-shaped bacteria, motile by means of cephalotrichous flagella. 

 No endospores formed. Chemo-autotrophic, oxidizing ammonia to nitrite. 

 The type species is Nitrosomonas europaea Winogradsky. 



7. Nitrobacter Winogradsky, 1892. 



Ellipsoidal to rod-shaped bacteria, either immotile or motile by means of 

 cephalotrichous flagella. No endospores formed. Chemo-autotrophic, oxi- 

 dizing nitrite to nitrate. 

 The type species is Nitrobacter ivinogradskyi Buchanan. 



8. Acetobacter Beyerinck, 1900. 



Ellipsoidal to rod-shaped bacteria, either immotile or motile by means of 

 cephalotrichous flagella. No endospores formed. Chemo-heterotrophic, oxi- 

 dizing various organic compounds, with a marked tendency to form acids as 

 products ol incomplete oxidation. Adapted to life in acid media. 

 The type species is Acetobacter pasteurianum (Hansen) Beijerinck. 



9. Pseudomonas Migula, 1894. 



Ellipsoidal to rod-shaped bacteria, either immotile or motile by means of 



* It has to be clearly understood that the diagnosis of this genus as given above is 

 not at all in agreement with the diagnosis given by Orla-Jensen who uses the name 

 as a synonym for Chromatium. Nevertheless, the name in question is adopted here to 

 match the names of the related genera Rhodospirillum, Rhodovibrio and Rhodococcus. 



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