^ 



lo BOTANICAL GAZETTE [july 



from the side, that is, in vertical section, making the description 

 of both forms comparable with that of the teleutospores 



{fig. 2, h). 



On Spartina this rust occurs exclusively on the hard and 

 smooth surfaces of the plant ; the under (smooth) side of the 

 blade, the sheaths, and the exposed parts of the internodes. 

 On Spartina polystachya and 5. glabra it grows equally well on 

 both surfaces of the blade. This difference of habit is correlated 

 with the fact that in these two hosts the hard tissues of the leaf 

 are almost equally well developed upon both sides of the blade, 

 so much so as to prevent the leaf from becoming much convo- 

 lute upon drying, as it does in the other species of the genus. 

 The writer is fortunate in having been able to examine all 

 the type material upon which the synonymy of the species is 

 based. The type of ^ciditim Fraxi?ii Schw., which is in the 

 Schweinitz collection at the Philadelphia Academy of Sciences, 

 consists of a single leaf, bearing thirteen round groups of aecidia. 

 The spots are much swollen, but too young to show open peridia. 



peridermiospora 



of the bases of 



Spartifia glabra M 



of which is in the herbarium of Mr. S. M. Tracy, the collector, 

 and the other is in the Ellis herbarium at the New York Botanical 

 Gardens. In the packet at the latter place is the following 

 unsigned note: **Spor. pyriform, 35-45 X 18-22 /x, contents 

 orange-red with a hyaline envelop, which is at first subtubercular- 



roughened, but finally becomes smooth or nearly so. The 



spores are much like those of Peridermmm pyriforme Pk." The 



type of Puccinia sp 



herbarium 



at the New York Botanical Gardens. It consists of quite a 

 number of portions of leaves, each about 10'^'" long, all well 

 covered with uredo- and teleutosori, and is accompanied by diag- 

 nostic and other notes. The host was at first supposed to be 

 Carex spargani aides, and was so stated in connection with the 

 original description, and hence the specific name; it was after- 

 ward thought to be Carex striata^ and is so labeled in Ellis and 

 Everhart's N. Amer. Fungi, no. 3475 ; finally the host was 



