222 



Mycologia 



spores agreed in every respect with the amphispores of the Wis- 

 consin specimens and that the colorless Puccinia spores had been 

 overlooked. The situation was still puzzling but it was evident 

 that another sedge rust with amphispores was added to our list. 

 To Dr. J. J. Davis is due the credit for first suggesting the possi- 

 bility that his specimens might represent Puc. micrqsora Korn. 

 A comparison of the description in Fuckel, Sym. Myc. 3 : 14 

 (1875) an d a later examination of the specimen in Fungi 

 Rhenani 2637 (1874) left no doubt as to the correctness of the 

 suggestion. The next specimens were soon collected in central 

 Pennsylvania and additional ones have since been sent in from 

 Oregon and Virginia, thus showing it to be present in numerous 

 widely separated localities. 



11. Puccinia minutissima Arth. Bull. Torrey Club 34:587. 



1907 



Aecidhim Nesaeae Gerard, Bull. Torrey Club 4: 47. 1873. Not 

 P. Nesaeae Ellis & Ev. 189)5. 



O & I. Pycnia and aecia on Decodon verticillatus. (For cul- 

 tures see Mycologia 7:245. 1915.) 



II. Urediniospores globoid or broadly ellipsoid, very small, 

 12-18 X 16-21 ^; wall golden-brown, 1-1.5/x, finely echinulate, 

 the pores, 2, slightly superequatorial. 



III. Teliospores oblong-clavate, 15-22 X 39-^4/^, slightly con- 

 stricted at the septum, the apex rounded or obtuse, narrowed 

 below; wall dark chestnut-brown, 1-1.5^ thick, much thicker 

 above, 9-13 /x; pedicel slightly tinted, about one-half length spore. 



On Car ex aquatilis, lasiocarpa. 



Distribution: In swamps or bogs of northeastern United 

 States, from Massachusetts and Delaware west to Indiana and 

 Wisconsin; also in Ontario. 



Exsiccati: Barth. N. Am. Ured. 801-951 — 1001 ; Barth. Fungi 

 Columb. 4063, 4102; Ellis & Ev. Fungi Columb. 258 (in part) 

 1382; Kellerm. Ohio Fungi 91; Sydow, Ured. 2419 — 2549. 



This species is especially characterized by the small uredinio- 

 spores in association with teliospores which are of average size. 

 Its aecial connection also serves to set it apart from any other 



