V/r l^innji of ////y/o/x. 203 



pointed, smooth, dark-brown, 15-22 by 30-45 /*; pedicel usually 

 about tbe length of the spore, sometimes longer, more or less 

 tinted. 



Spots obliterated, sori densely aggregated, elevated, fuscous, obtuse, 

 linear, abbreviated. Spores fuscous. Although not confluent, yet oc- 

 cupying almost the entire leaf. Very frequent in autumn in leaves, 

 culms and sheaths of various species of Awlrttpogvn. Schweinitz, N. 

 Am. Fung., No. 2911, p. 295. 



On Andropogon furcatus : Boone, Sept. 2, 1423; Ogle, Sept. 

 2<>. (HS4, II., III.; Rock Island, Sept. 27, 1678. A. sooparius: 

 Ogle, Sept. 25, 0172, II., III., Sept. 26, 6200. II., III.; Union, 

 Oct. 22, 1U60. 



In Thiimen's Mycotheca Universalis, No. 1336, the speci- 

 mens named Pifccinia Ellisiana, Thiim., which Farlow identi- 

 fies (Proceed. Am. Acad. Arts & Sc v July, 1883, p. 81) as P. 

 andropogi, Schw., the teleutospores are often more narrow and 

 pointed, are lighter in color, and the pedicels are longer than in 

 the Illinois specimens. 



In the specimens examined the uredospores vary consider- 

 ably, even on the same leaf, as well as upon different hosts. 



P. maydis, Carradori. 



II. , III. Amphigenous. Sori subcircular to oblong, irreg- 

 ularly scattered, often confluent, rather tardily rupturing the 

 epidermis, whose upturned edges persistently remain; uredo- 

 spores subglobose, epispore rather thick, echinulate, 25-30 /*. 

 Teleutospores broadly elliptical, considerably constricted at the 

 septum, ends mostly obtusely rounded, but sometimes thick- 

 ened at the apex and variously pointed, smooth. 15-22 by 30-45 

 P ; pedicel slightly colored, once to twice the length of the spore. 



P. sorghi, Schw. Spots none ; sori broad, of different forms, vari- 

 ously lobed, at first covered by the epidermis, then denudated but sur- 

 rounded by the lacerated epidermis, often also internally fissured, 2-4 

 lines long and broad. Many of the sori occur on the nerves of the 

 leaves. Spores black, large ; pedicels short. Schweinitz, N. Am. Fung., 

 No. 2910, p. 295. 



On leaves of Zca May*: McLean, July 20, 2345, T.I., III., 

 Aug. 4, 2344, II., Ill, Aug. 19, 5636, II., III., Sept. 6, 5664, 

 Oct. 11, 1830; Champaign, Aug. 13, 1032, II.; McHenry, Aug. 



