224 NORTH AMERICAN FLORA [V01.UMK 7 



3. Nigredo Cligayi(Pat. & Hariot) Arthur. 



Uromyces Clignyi Pat. & Hariot, Jour, de Bot. 14 : 237. 1900. 



O and I. Pycnia and aecia unknown. 



II. Uredinia hypophyllous, scattered, oblong or linear, rather early naked, cinnamon- 

 brown ; uredinio spores globoid, large, 24-29 by 26-32 /x ; wall pale cinnamon-brown, 1.5-2 ^ 

 thick, moderately and rather closely echinulate, the pores numerous, 8-10, scattered. 



III. Telia hypophyllous, oblong or oval to linear, 0.3-1 mm. long, scattered, rarely 

 confluent, causing a slight discoloration, rather tardily naked, chocolate-brown, ruptured 

 epidermis not conspicuous ; teliospores globoid, 22-31 p. in diameter ; wall chocolate-brown, 

 thick, 3-5/1, somewhat thicker above, 4-7 ju, smooth; pedicel hyaline or slightly tinted, 

 fiesuous, as long as spore or longer. 



On Poaceae : 



Andropogon hiriijiorus Kunth, Jalisco; Lower California, Mexico (state). 



Andropogon Schottii Rupr., Chihuahua. 

 Type locality : Western Sudan, on a grass of the tribe Andropogoneae . 

 Distribution : Northern to central Mexico ; also in tropical Africa. 



4. Nigredo graminicola (Burrill) Arth. Result. Sci. Congr. Bot. 



Vienne 343. 1906. 



Uromyces graminicola Burrill, Bot. Gaz. 9: 188. 1884. 

 Uromyces Fanici Tr^Qy y Jour. Myc. 7: 281. 1893. 

 Caeom^urus graminicola Kuntze, Rev. Gen. 3^ : 450. 1898, 

 Caeomurus Panici Kuntze, Rev. Gen. 3=* : 450. 1898. 

 Nigredo Panici Arth. Result. Sci. Congr. Bot. Vienne 344. 1906. 



O and I. Pycnia and aecia unknown. 



II. Uredinia chiefly hypophyllous, scattered, oblong or linear, small, 0.4-0. 8]mm. long, 

 rather early naked, pulverulent, cinnamon-brown, ruptured epidermis noticeable ; uredini- 

 ospores subgloboid or obovoid, 15-19 by 18-23 ^u ; wall pale cinnamon-brown, 2-2.5 11 thick, 

 moderately verrucose-echinulate, the'pores 3 or 4, approximately equatorial. 



III. Telia atnphigenous, scattered, sometimes crowded and confluent, linear, 0.5-2 mm. 

 long, early naked, pulvinate, blackish-brown, ruptured epidermis rather conspicuous; 

 teliospores obovoid or broadly ellipsoid, often angular, 13-19 by 21-32 /k, usually narrowed 

 below, rounded or obtuse above ; wall chestnut-brown, 1.5-2^ tjiick, much thicker at apex, 

 3-9 M) smooth ; pedicel slightly tinted, about twice length of spore. 



On Poaceae : 



IPayiicum, anceps Michx. {P. rosiraium Muhl.), Mississippi. 

 Panicum depauperaium Muhl., Missouri. 



Panicum. virgatum. I^. , Florida, Illinois, Iowa, Kansas, Mississippi, Nebraska, North 

 Carolina, Oklahoma, South Dakota. 

 Type locality: McLean County, Illinois, on Panicum virgatum. 



Distribution : Southern South Dakota and Illinois southward to Oklahoma'and Florida. 

 Illustration: Sydow, Monog. Ured. 2: 335. 



HxsiccATi: Carleton, Ured. Am. 1; Kellerm. & Swingle, Kan. Fungi 48 ; Sydow, Ured. 

 1155; Arth. & Holway, Ured. Kxs. Ic. 19a, b, c; Rab.-Wint. Fungi Kur. 3410; Roum, Fungi 

 Sel. 5i25; Vesterg. Micr. Rar. Sel. 1135; D. Griff. W. Am. Fungi .S".^; Earth. Fungi Columb. 

 3496; Barth. N. Am. Ured. 190 ; Ellis & Hv. N. Am. Fungi 1865. 



5. Nigredo leptoderma (Sydow) Arthur. 



Uromyces lepiodermus Sydow ; Sydow & Butler, Ann. Myc. 4 : 430. 1906. 

 Uredo Isachnes Sydow ; Sydow & Butler, Ann. Myc. 4 : 444. 1906. 

 Uredo Panici-prostrati Sydow ; Sydow & Butler, Ann. Myc. 4 : 444. 1906. 

 Puccinia (?) panicicola Arth. Bull. Torrey Club 34 : 586. 1908. 



O and I. Pycnia and aecia unknown. 



II. Uredinia amphigenous, scattered, oval, 0.1-0.3 mm. wide by 0.2-0.4 mm. long, soon 

 naked, pulverulent, dark cinnamon brown, ruptured epidermis noticeable ; urediniospores 

 broadly ellipsoid or obovoid, 23-25 by 26-30 ^ ; wall dark cinnamon-brown, rather thin, 

 1.5 /z, closely and strongly echinulate-verrucose with blunt points, the pores usually 3 or 4, 

 sometimes only 2, equatorial. 



III. Telia amphigenous, scattered, very small and inconspicuous, punctiform, about 

 0.2-0.4 mm. long, subepidermal, blackish ; teliospores subgloboid or angular-globoid, 16-20 



