150 International Code of Nomenclature 



Appendix C. Opinions 5, 6. 



opinion the "selection of type species" is made "in accord with 

 generally accepted rules thus making formal action unnecessary." 

 The Opinion as approved by the Judicial Commission is as follows: 



Opinion 5. 



1. The generic name Pseudomonas Migula 1894 is to be conserved and 

 placed in the list of nomina generica conservanda. 



2. The generic name Pseudomonas Migula 1894 is to be associated 

 with the species designated and described by Migula 1895. 



3. The type species of the genus Pseudomonas Migula 1894 is Pseudo- 

 monas aeruginosa (Schroeter) Migula 1900 Bacterium aeruginosum 

 Schroeter 1872, Bacillus pyocyaneus Gessard 1882, Pseudomonas 

 pyocyanea Migula 1895. 



REFERENCES 



Editorial Board. Status of Pseudomnnns Migula 1894 as a Generic Name 



and of Pseudomonas aerus^inosa (Schroeter) Migula 1900 as Type Species 



Internatl. Bull. Bad. Nomen. and Tax. / (H :41-42. 1951. 

 Judicial Commission, Opinion No. 5. Internatl. Bull. Bact. Nomen. and Tax. 



2:121-122. 1952. 

 Migula, W. Ueber ein neues System der Bakterien. Arb. Bakt. Inst. Karlsruhe. 



i:237. 1894. 

 . Schizomycetes (Bacteria, Bacterien) in Engler, \. and K. Praiitl. Die 



Naturlichen Pflanzenfamilien. Teil 1. Abt. la. 29. 1895. 



. System der Bakterien. 2:884. 1900. 



Schroeter, J. Ueber einige durch Bacterien gebildete Pigments, in Cohn, F., 



Beitrage z. Biologic d. Pflanzen. 1 (Heft 2) :126. 1872. 

 Gessard, C. Sur les Colorations bleue et verte des linges a pausements. C. R. 



Acad. Sci. Paris. P^:536. 1882. 



OPINION 6 



Conservation of the Generic Name Chlorobacterum 

 Lauterborn 1915 against Chlorobocterium Guillebeau 1890 



The currently used bacterial generic name CJilorobacterium Lauter- 

 born 1915 is a later homonym of ChlorohacterUun Guillebeau 1890. 

 The latter name has not been used in the literatiue of bacteriology 

 for more than half a century. A Preliminary Statement (1951) by 

 the Editorial Board outlining the problem was published, likewise 

 a series of suggestions as to alternative actions (1953) . At the meet- 

 ing of the Judicial Commission on September 4, 1953, it was agreed 

 that the existence of the earlier homonym Chlorobacteriiim Guille- 

 beau should not constitute a bar to the use of the later homonym 

 Chlorobacteriiim Lauterborn, and that the name Cholorobacteriiitu 

 Guillebeau should be rejected. 



Opinion 6. 



The generic name Chlorobocterium Guillebeau 1890 is placed in the list of 



nomina generum rejicienda. 



