og 2 NATURAL HISTORY BULLETIN. 



much elongated. The uredospores are brown, evenly and 

 minutely papillose, but not strictly echinulate, pores small, 

 scattered, apparently four to six. The characters which dis- 

 tinguish the uredospores of this species from those of Puccinia 

 panici are all slight, and chiefly relate to the size and echinu- 

 lation. 



The teleutosori are black, prominent, much elongated, fre- 

 quently as abundant on sheaths and culms and even the panicle 

 as on the leaf blades. When well developed there is consid- 

 erable resemblance in gross appearance to Puccinia -poculi- 

 fonnis. In large sori the pedicels of the teleutospores are 

 usually very long, attaining 75 to 100 //. 



The spores of Puccinia -panici are often found upon the 

 same leaf blades, and confuse the collector. 



EXSIC. 

 Ellis and Everhart, N. A. F. 1S65. 

 Carleton, Ured. Amer. 1. 

 Kellerman and Swingle, Kans. Fungi 4S. 

 Rabenhorst-Winter, Fungi Europsei 3410. 

 Roumeguere, Fungi Selecti Exsic. 5125. 

 Ellis and Everhart, Fungi Columb. 547. 



20. Puccinia panici Diet. (1895. Erythea 3: 80.) 



20a. On Panicum virgatum L. Rockport, Kans., Bartholomew. 



20b. On Panicum virgatum L. Decorah, Iowa, Holxvay. 



20c. On Panicum virgatum L. Decorah, Iowa, Hol-way. 

 Orig. Desc. "Uredo: Spots yellowish, indefinite; sori epiphyllous, very 

 minute, oblong, surrounded by the burst epidermis, brown. Uredo- 

 spores broadly elliptical or globose, densely echinulate, brown, 25-31 

 X25-29M. Teleutospores: sori epiphyllous, pulvinate, black, small, ob- 

 long or linear. Teleutospores oblong or clavate, apex thickened, 

 rounded or conical, base rounded or attenuated, central constriction 

 slight, 29-48X15-21,", brown. Pedicels of different length, on an aver- 

 age as long as the spores." 



A seemingly restricted species and not often collected, being 

 generally inconspicuous and easily overlooked. The teleuto- 

 sori, which are rarely confluent, are unusually small, often 

 mere points, and are often arranged in evident lines. Their 

 minuteness and position only on the upper surface of the leaf 

 make it possible when well developed to separate it with con- 



