OF ARTS AND SCIENCES. 65 



VII. 



NOTES ON SOME SPECIES IN THE THIRD AND 

 ELEVENTH CENTURIES OF ELLIS'S NORTH AMER- 

 ICAN FUNGL 



By W. G. Farlow. 



Presented May 9th, 18S3. 



The third Century of Ellis's North American Fungi, issued in 

 1879, and the eleventh, issued in 1883, contain almost exclusively 

 species of Uredinece and Peronosporece. As a considerable number of 

 these were collected by me, and others were examined by me at the 

 request of Mr. Ellis, I have taken occasion in the present paper to 

 offer certain notes with regard to the determination and distribution 

 of some of the species, which are either new or not sufficiently well 

 known. 



In the first place, a few remarks on the nomenclature adopted are 

 perhaps necessary. In publishing a series oi fungi exsiccati like that 

 of Mr. Ellis, greater latitude is naturally allowed than were one pub- 

 lishing a monograph of the UredinecB or Peronosporece. In the latter 

 case one would be expected to give names only to what he regards as 

 good species, and all other names would be reduced either to synonyms, 

 or would appear under the head of species inqidrendce. In issuing a 

 series of exsiccati, however, one is not only at liberty to distribute 

 species the validity of which seems to him certain, but it is frequently 

 desirable to distribute forms which have received definite names from 

 the earlier mycologists, although their specific value is doubtful. In 

 the latter case, all that is incumbent on the editor is, as far as possible, 

 to be sure that the specimen distributed really corresponds to the form 

 which originally bore the name given. In the Centuries to which we 

 refer, several species bear the names of Schweinitz and other earlier 

 mycologists ; and it is not to be understood that the species are really 

 considered to be valid, but merely that, in the opinion of the editor, 

 the specimen represents the form originally described under the name 

 given, and that the species must be studied further. 

 VOL. xviii. (n. s. X.) 5 



