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On the Nomenclature of Fungi Having Many Fruit-Foems. 



J. C. Arthur. 



( Abstract.) 



The paper begins with a statement of the views of Dr. Mngnus and 

 others, who hohl tliat with sucli forms as the hetercecious rusts the action 

 of the law of priority in the selection of specitic names should extend 

 only to names applied to the teleutosporic form. Thus, the common grain 

 rust should be called Pucciiiia (/ra minis Pers., and not I'livvinid ixiciiliforniis 

 (Jacq.) Wettst. 



The argument is upheld that tliis view practically rests upon the 

 inference that the genus Puccinia is a foini-genus liased upon tlie teleuto- 

 sporic stage. A true genus, it is maintained, must of necessity embrace 

 all stages of development and all structural parts of every species under 

 it. The name of the genus, a.s well as that of the species must, moreover, 

 so far as its nomenclatorial treatment is concerned, be considered as 

 simply appellative, and without regard to its derivation or significance. 



These ideas are elucidated with a variety of illustrations. The conclu- 

 sion is drawn that with clear concepts of this nature there can be no 

 question of the desirability of applying the law of priority to fungi with 

 many fruit-forms, in a manner similar to its use among phanerogams. 



The proper name for the common grain rust, according to tliis 

 method, is Piicciiiid /lociilifonjiis (.Tacq.) Wettst. 



