88 MEDICAL MYCOLOGY 



originally designated as the type, the generic name must be retained 

 for the genus including that species. When no type was designated, 

 a type must be chosen according to the regulations which will be 

 given (Appendix I). 



Art. 52. When a species is divided into two or more species, the 

 specific epithet must be retained for one of them, or (if it has not 

 been retained) must be re-established. When a particular specimen 

 was originally designated as the type, the specific epithet must be 

 retained for the species including that specimen. When no type was 

 designated, a type must be chosen according to the regulations to be 

 given (Appendix I). 



The same rule applies to subdivisions of species ; for example, to a 

 subspecies divided into two or more subspecies, or to a variety di- 

 vided into two or more varieties. 



Section 9.^ — Retention of Names or Epithets of Groups below the 

 Rank of Genus on transference to another Genus or Spe- 

 cies (Art. 53-55). 



Art. 53. When a subdivision of a genus is transferred to another 

 genus (or placed under another generic name for the same genus) 

 without change of rank, its subdivisional name must be retained, or 

 (if it has not been retained) must be re-established unless one of the 

 following obstacles exists: (1) that the resulting association of 

 names has been previously published validly for a different subdivi- 

 sion, or (2) that there is available an earlier validly published sub- 

 divisional name of the same rank. E. g. Saponaria sect. Vaccaria 

 DC, transferred to Gypsophila, becomes Gypsophila sect. Vaccaria 

 (DC.) Gren. & Godr. 



Art. 54. When a species is transferred to another genus (or placed 

 under another generic name for the same genus), without change of 

 rank, the specific epithet must be retained or (if it has not been re- 

 tained) must be re-established, unless one of the following obstacles 

 exists: (1) that the resulting binary name has been previously and 

 validly published for a different species, (2) that there is available 

 an earlier validly published specific epithet. 



When the specific epithet, on transference to another genus, has 

 been applied erroneously in its new position to a different plant, it 

 must be retained for the plant on which the group was originally 

 based : e. g. the specific epithet of Pinus Mertensiana Bong, was trans- 

 ferred to Tsuga by Carriere, who, however, erroneously applied the 

 new combination Tsuga Mertensiana to another species of Tsuga, 

 namely, T. heterophylla (Raf.) Sarg., as is evident from his descrip- 

 tion: the epithet Mertensiana (Bong.) must be retained for Pinus 

 Mertensiana Bong, when that species is transferred to Tsuga; the cita- 

 tion in parentheses (under Art. 49) of the name of the original author, 

 Bongard, indicates the type of the epithet, Tsuga Mertensiana (Bong.) 

 Sargent, non Carriere. 



Art. 55. When a variety or other subdivision of a species is trans- 

 ferred, without change of rank, to another genus or species (or 

 placed under another generic or specific name for the same genus 

 or species), the original subdivisional epithet must be retained or (if 

 it has not been retained) must be re-established, unless one of the fol- 

 lowing obstacles exists: (1) that the resulting ternary combination 



