212 



On the Nomenclature of Fu.noi Having Many FiiuiT-FoiiMS. 



J. C. Arthur. 



( Abstract. ) 



The paiKT begins with a statement of the vieAvs of Dr. Magnus and 

 others, Avho hold that with sm-h forms as the heteroecious rusts the aet'oii 

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

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

 rust should be called I'lK-cniid (/rdiiiiiiis Pers., and not I'lue'mht liociilifoi'ini.'i 

 (Jacq.) Wettst. 



The argument is uplield that this view practically rests upon the 

 inference that the genus Puccinia is a fdim-genus based upon the 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, as well as that of the species must, moreover, 

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

 simply appellative, and witliout 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 tlils 

 method, is Pucciiiiu iioridifonii'a^ (.Tacq.j Wettst. 



