232 NORTH AMERICAN FLORA [V01.UME 7 



21. Nigredo arguta (Kern) Arthur. 



Uromyces argutus Kern, Torreya 11 : 214. 1911. 



O and I. Pycnia and aecia unknown. 



II. Uredinia amphigenous, numerous, scattered, on rather large brownish or purplish 

 spots, usually solitary, linear, 1-4 mm. long, rather tardily naked, slightly pulverulent, 

 cinnamon-brown, ruptured epidermis noticeable; urediniospores broadly ellipsoid, 19-23 by 

 25-32 ju; wall rather thick, 2-3 /a, light cinnamon-brown, closely and very inconspicuously 

 echinulate, the pores usually 3, occasionally 4, approximately equatorial, rather distinct. 



III. Telia amphigenous, scattered, solitary, sometimes on discolored spots, linear, 1-2 

 mm. long, rather tardily naked, pulvinate, blackish, ruptured epidermis noticeable; telio- 

 spores ellipsoid or obovoid, 16-19 by 24-32 ju, usually narrowed both above and below ; wall 

 dark chestnut-brown, 1.5-2 /x thick, much thickened at apex, 7-10 /z, smooth; pedicel 

 tinted next to the spore, about twice length of spore. 



On Poaceae : 



Spartina glabra Muhl., Florida. 

 Type locality : Miami, Florida, on Spartina glabra. 

 Distribution : Known only from the type locality. 



22. Nigredo Eleocharidis Arthur. 



Uromyces Eleocharidis Arth. Bull. Torrey Club 33 : 514. 1906. 



O and I. Pycnia and aecia unknown. 



II. Uredinia amphigenous, scattered, oblong, 0.3-1.5 mm. long, tardily dehiscent by 

 one or more longitudinal slits, dark cinnamon-brown ; urediniospores ellipsoid to broadly 

 ellipsoid, 15-19 by 19-29 /x ; wall golden-yellow, thin, 1-1.5 ^i, sparsely and finely echinulate, 

 the pores 2, approximately equatorial. 



III. Telia amphigenous, thickly scattered, oblong, 0.5-2 mm. or more long, tardily 

 dehiscent by longitudinal slits, chocolate-brown ; teliospores angularly obovoid, truncate or 

 rounded above, narrowed below, 16-22 by 27-45 ju ; wall light chestnut-brown, rather thin, 

 1-1.5 ju, thicker above, 7-lOju, smooth ; pedicel tinted, about once to once and a half length 

 of spore. 



On Cyperaceae : 



Eleocharis paluslris (ly.) R. & S. {E. glaucescens Schult.), Iowa, Kansas, Nebraska, North 

 Dakota, South Dakota, Wisconsin. 

 Type locality: Aberdeen, South Dakota, on Eleocharis paluslris. 

 Distribution : Northern Mississippi and Missouri basins. 



ExsicCATi: D. Griff. W. Am. Fungi 60, 60a; Barth. Fungi Columb. 2293, 3291; Sydow, 

 Ured. 2102,2252; Brenckle, Fungi Dak. 56*. 



23. Nigredo Rhyncosporae (Ellis) Arth. Result.' Sci. Congr. Bot. 



Vienne 344. 1906. 



Uromyces Rhyncosporae Ellis, Jour. Myc. 7 : 274. 1893. 

 Urotnyces Rhyncosporae P. Henn. Hedwigia 35 : 226. 1896. 

 Caeomurus Rhyncosporae Kuntze, Rev. Gen. 3^ : 450. 1898. 



O and I. Pycnia and aecia unknown. 



II. Uredinia hypophyllous, scattered, oval or oblong, small, 0.2-0.5 mm. long, very 

 tardily naked, slightly pulverulent, chestnut-brown, ruptured epidermis conspicuous ; 

 urediniospores ellipsoid or obovoid, 13-19 by 18-26^; wall golden-brown, thin, 1-1.5 m, 

 rather finely verrucose-echinulate, the pores 2, approximately equatorial. 



III. Telia hypophyllous, scattered, frequently crowded and somewhat confluent, oblong 

 or suborbicular, 0.1-0.4 by 0.5-1 mm. across, rather early naked, pulvinate, blackish-brown, 

 ruptured epidermis evident ; teliospores ellipsoid, cuneiform or clavate, 10-15 by 20-29 m, 

 rounded, truncate, or acuminate at apex, usually narrowed below ; wall chest nut- brown or 

 lighter, sometimes paler below, thin, 1-1. S^t, thicker at apex, 5-9 /x, smooth; pedicel col- 

 ored, about length of spore. • 



On Cyperaceae : 



Rynchospora alba (I^. ) Vahl, Indiana, New Jersey, Rhode Island, Vermont; Ontario. 

 Rvnchospora alba macra Clarke, Florida. 

 Rynchospora aurea Vahl, Porto Rico. 



