North American Species of Puccinia on Carex 211 



Type collected near Antigua, Depart. Sacatepequez, Guate- 

 mala, Feb. 3, 1908, W. A. Kellerman, 7197; other collections San 

 Rafael, Jan. 10, 1915, 55, and Solola, Jan. 27, 191 5, 124, both by 

 E. IV. D. Holway. 



The Guatemalan collections here listed are used as the founda- 

 tion of a new species. The pore arrangement throws this species 

 in a group with P. atro-fusca and P. macrospora from which it 

 differs markedly in other spore characters. There is a general 

 resemblance to P. urticata but the pores in the Guatemalan speci- 

 mens are usually 2, sometimes 3, whereas they are usually 3, 

 rarely 4, in P. urticata; there are also differences in teliospores. 

 The variations in spore characters plus the geographic interval 

 between these specimens and any of the other species makes it 

 seem wise to characterize a new species. 



2. Puccinia atro-fusca (Dudley & Thomp.) Holway, Jour. 

 Myc. 10: 228. 1904 



Uromyces atro-fuscus Dudley & Thomp. Jour. Myc. 10 : 55. 

 1904. 



O & I. Pycnia and aecia unknown. 



II. Urediniospores of the typical sort broadly ellipsoid, 16-21 

 X 21-26 fi; wall cinnamon-brown, 1.5-2/* thick, rather closely 

 echinulate, the pores 2, equatorial; urediniospores of the modified 

 sort (amphispores) broadly ellipsoid or obovoid, 17-24X23- 

 32 /x ; wall chestnut-brown, 2.5-3.5 fi thick, somewhat thicker above, 

 4-7 rather sparsely but prominently verrucose-echinulate espe- 

 cially above, the pores 2, approximately equatorial. 



III. Teliospores narrowly obovate-ellipsoid or clavate-oblong, 

 16-22 X 30-43 11, rounded or obtuse at each end, slightly con- 

 stricted at the septum; wall chestnut-brown, 1.5-2 /x, much thicker 

 above, 5-7 /a; pedicel slightly tinted, about length of spore. 



On Carex Douglasii, nigricans, praegracilis, siccata. 



Distribution : Southern Alberta, Montana, and New Mexico 

 west to the Pacific Coast. 



Exsiccati 6 : Barth. N. Am. Ured. 820, 102/; Clements, Crypt. 

 Colorad. Form. 547 ; Barth. Fungi Columb. 2676, 3742. 



6 In listing the Exsiccati those on the Carex host are given first and 

 italicized ; those on the aecial host are set apart by a dash and are not 

 italicized. 



