AMERICAN UREDINE.E. 1Q0 



siderable certainty, without the use of a lens, from Uromyces 

 gramiiiicola and from Puccinia z-irgata. both inhabiting the 

 same host. 



Single-celled teleutospores in the same sorus with the usual 

 form are not rare, and in shape and coloring closelv resemble 

 the teleutospores of Uromyces graminicola. The uredospores 

 of the two species also look much alike, but those of the 

 Puccinia are slightly larger, and possess more prominent 

 echinulation. The echinulation on the uredospores of the 

 latter is somewhat irregular, but for the most part thickly 

 covers the spores. The pores are small and difficult to detect, 

 scattered, and apparently four to six in number. 

 ex sic. 



Ellis and Ever hart, N. A. F. 304S. 

 Ellis and Everhart, Fungi Columb. 264. 



21. Puccinia flaccida B. & Br. (1S73. J our - Linn. Soc. 

 Bot. 14: 91.) 



21a. On Panicum crus-galli L. Rooks Co., Kans., Bartholomew. 



Orig. Desc. "821. P. flaccida B. & Br. Soris parvis brevibus; sporis 

 flaccidis, pedicello longo hvalino. obtusis, medio contractus (No. 1136). 

 On Panicum. Peradeniva. Spores .004 long, with pedicels .009." 



II. III. Sori amphigenous. scattered, punctiform or oblong, 

 tardily naked, ruptured epidermis conspicuous. Uredospores 

 globose to broadly ovate or elliptical, brown. 22-30 u in diam- 

 eter, echinulate. pores 4-6. evident, scattered. Teleutospores 

 of the usual type few. oblong or fusiform-clavate. 17-20x35- 

 40 «. apex narrowed and thickened: most of the teleutospores 

 of a great variety of forms due to the septum being placed at 

 .all angles, even vertical, and the two cells seeminglv merely 

 adpressed. or the upper adhering to the lower, 19-26x30-38//. 

 wall thin, smooth, apices of both cells thickened, bases of 

 both cells narrowed, often acute, paler brown than the uredo- 

 spores; pedicel 50-75," long, hyaline. 



A rather inconspicuous species, remarkable for the strange 

 construction of the teleutospores. It was first detected in this 

 country by Burrill, who vouches (Par. Fungi of Ills., p. 202) 



