1 10 International Code of Nomenclature 



Recommendation 27e. Orthography and Gender of Names 



The Bacteriological Code agrees with the Botanical Code in 

 recommending that in Latinization of non-classic names ending in a 

 consonant the genitive is to be formed by adding -ii. 



The Zoological Rules on the other hand recommend that in all 

 cases the genitive of non-classic Latin names should be formed by 

 the addition of -i. The recent (1957) Bradley Draft of the proposed 

 revision of the Zoological Code accepts the correctness of cither geni- 

 tive ending -i or -ii. 



This difference between the recommendations of the codes is 

 sometimes confusing. The specific epithets derived from proper 

 names have frequently been formed by bacteriologists by the addition 

 of -i. In some cases names of species in different genera may have 

 specific epithets derived from the name of the same person, one 

 author used the ending -ii, the other -i. Rule 27 requires that the 

 original spelling of names or specific epithets should be accepted, 

 even though not formed in conformity with a recommendation. In 

 many cases specific epithets in the species names of bacteria have been 

 changed by a later writer to comply with the Recommendation 27e. 



Genitives formed from the personal name of a man by addition 

 of -ii in the one case and -/ in the other should be regarded as ortho- 

 graphic variants of the same word. Within the same genus two species 

 names with specific epithets differing only in the genitive ending 

 are to be regarded as homonyms. 



Some authors "correct" all genitives ending in -i to -// even 

 though there is no authorization of such change under the rules. 



When an epithet in adjectival form is based upon the name of a 

 man, it is customarily formed by the use of the adjectival endings 

 -anus or -ianus. When the name ends in a vowel other than -a, the 

 ending -arms is preferred. If the word ends in -a or -us this ending is 

 altered to -anus, if the word ends in -ius or -ia or in a consonant the 

 adjective ends in -ianus. Examples: pasteurianus in Acetobacter pas- 

 teurianus (from Pasteur) , Acetobacter kuetzijigianus (from Kuetzing) , 

 Rhodospirilhun 7nolischianum (from Molisch) , Pseudomonas touel- 

 liana (from Tonelli) , Xanthomonas hemmiana (from Henuni) . 



