Farasifir Fungi of Flinois. 197 



Hypogenous ; spots pallid or none ; sori oblong or linear, sometimes 

 regularly arranged at equal intervals in long parallel lines, narrow, sur- 

 rounded by the ruptured epidermis, black ; spores narrow, oblong-cla- 

 vate or elongated, septate above the middle, strongly constricted, having 

 the lower cell more narrow than the upper, and cylindrical or slightly 

 tapering downwards, .0018 .0024 in. long, '0006 in. broad ; peduncle 

 colored, thick, very short.— Peck, XXV. Rep. N. Y. Mus., p. 12:5. 



On leaves of Scirpus afror'nrns: Piatt, Aug. l(i, 109:5; 

 Cook, Sept. o. 1451. 



P. windsorisB, Schw. 



II., III. Hypogenous, occasionally somewhat ampliige- 

 nous. Sori small,, little elevated, irregularly scattered, very 

 numerous, sparingly confluent, linear or oblong, soon naked, 

 the ruptured epidermis scarcely evident; uredospores subglo- 

 bose or obovate, epispore medium thick, sharply echinulate, 

 rather deep brown, 18-24 ^: teleutospores broadly elliptical or 

 obovate, slightly or not at all constricted at the septum, mostly 

 obtusely rounded at the ends, upper segment mostly larger, 

 vertex slightly thickened, smooth, 18-21 by 'll-'iW) ,u; pedicel 

 about the length of the spore or shorter, stout, rather dee])lv 

 colored. 



On Mnhh')ihn-(/i(i: Stephenson, Sept. 18, 5884, II., III. 



P. graminis, Pers. 



I. Hypogenous. Spots definite, usually small, purple, 

 somewhat thickened: tecidia irregularly crowded, or sometimes 

 circinate, short, border narrow, numerously lacerated, little re- 

 curved: spores subglobose or angular, epispore thin, minutely 

 tuberculate. contents hne-granular. 11-15^; spermagonia mi- 

 nute, clustered, not usually numerous, opposite the iecidia. 



II. Amphigenous. Sori linear, on the leaves short and 

 scattered, on the leaf-sheaths often confluent in long lines, 

 orange-yellow; spores narrowly obovate or elliptical, epispore 

 thick, strongly echinulate, 18-21 by 27-86 ^. 



III. Sori linear to elliptical, often confluent in long lines, 

 mostly on the leaf-sheaths, rather prominent, soon naked, black; 

 spores clavate or narrowly elliptical, mostly somewhat con- 

 stricted, vertex strongly thickened, often pointed imt some- 



