Parasitic Fungi of Illinois. 201 



This species is certainly closely related to Puccinia rubigo- 

 rcra. Indeed, it is scarcely possible to separate them, except 

 by the terminal projections of the teleutospores in P. coronata. 

 arid these are present in varying degrees, sometimes (as in No. 

 2334) nearly wanting. 



P. emaculata, Schw. 



II., III. Mostly epigenous, sometimes amphigenous. Sori 

 small, rather prominent, mostly very numerous, irregularly scat- 

 tered or crowded, rarely confluent on the leaves, but on the 

 sheaths forming long, irregular lines, black, rather early erum- 

 pent but long surrounded by the ruptured epidermis; uredo- 

 spores subglobose, epispore rather thin, sharply but minutely 

 echinulate. 15-24 /*: teleutospores elliptical or broadly clavate, 

 slightly constricted, vertex strongly thickened and obtusely 

 pointed or rounded, narrowed below, smooth, not deeply col- 

 ored, 15-21 by 30-48 /*; pedicel once to once and a half as long 

 as the spore, tinted. 



Entirely without spots ; at first sori entirely covered or sparingly 

 erumpent, then often confluent, minute, abbreviated, narrow, parallel, 

 often acuminate at both ends. Spores black, rather small, when im- 

 mersed in water fuscescent. Everywhere on species of Panicum, espe- 

 cially P. pubescent in fields. Schweinitz, N. Am. Fung., No. 2912, p. 295. 



On Tricuspis seslerioides : Union, Nov. 4, 2274. Eragrostis 

 pectinacea: Union, Oct. 21, 1903. Panicum capillare: LaSalle. 

 Sept. 14, 1537, II., Sept. 29, 6238; Rock Island, Sept. 21, 16()9 ; 

 Sept. 23, 1628, Sept. 26, 1661, Sept. 27, 1679; JoDaviess, Sept. 

 19, 5993; Stephenson, Sept. 21, 6059; Ogle, Sept. 23, 6142, IT., 

 III.; Fulton, Oct. 1, 1768. P. virgatum: Lee, Sept. 9, 5760; 

 Ogle, Sept. 22, 6109; Rock Island, Sept. 27, 1695. 



On Panicum virgatum the teleutospores have in each seg- 

 ment a small circular nuclear spot, and the pedicels are nearly 

 colorless. On Tricuspis seslerioides (No. 2274) and Eragrostis 

 pectinacea (No. 1903) the sori are mostly hypophyllous, and the^ 

 teleutospores are often lighter colored, with hyaline pedicels. 



