"228 NORTH AMERICAN FLORA [V01.UME 7 



confluent, long covered by the epidermis, grayish-black ; teliospores broadly cuneiform or 

 subpyriform, 15-20 by 19-27 ju, the apex rounded or truncate, the base usually narrowed, 

 sometimes rounded; wall golden-brown, somewhat darker above, 1.5-2/* thick, slightly 

 thicker above, 2-3 (x, smooth ; pedicel slender, colored, about length of spore or shorter. 



On Poaceae : 



Alopecurus aristulatus M.\chi^. {A.fulvus Smith, A. geniculatus arislulatusTorr.), Colo- 

 rado, Minnesota, Nebraska, Wyoming. 

 Type locality: Brainerd, Minnesota, on Alopecurus geniculatus '^ arista ta^^' error for A. 

 gen. aHstulatus. 



Distribution : Northern Minnesota to eastern Wyoming and southward to Colorado. 

 Illustration: Bull. Lab. Nat. Hist. Univ. Iowa 4; pi. 4,f. 18. 



BJxsiccATi : Barth. Fungi Columb. 2289, 2389 ; D. Griff. W. Am. Fungi 2(^2 ; Arth. & Holway, 

 Ured. Kxs. Ic. 18a, b. 



13. Nigredo amphidyma (Sydow) Arthur. 



Uromyces amphidymus Sydow, Ann. Myc. 4 : 29. 1906. 

 Uromyces Glyceriae Arth. Bull. Torrey Club 37 : 572. 1910. 



O and I. Pycnia and aecia unknown. 



II. Uredinia amphigenous, intercostal, scattered, oval or lens-shaped, small, 0.2-0.4 

 mm. long, soon naked, pulverulent, brownish-yellow, ruptured epidermis usually incon- 

 spicuous ; uredinidspores broadly ellipsoid or globoid, 16-21 by 18-26 ju ; wall pale golden- 

 yellow, 1.5-2/i thick, finely and evenly verrucose-echinulate, the pores 6-8, scattered, 

 distinct. 



III. Telia amphigenous, intercostal, scattered, oval or lens-shaped, small, 0.2-0.4 mm. 

 long, tardily naked, pulverulent, dark chestnut-brown, epidermis rupturing by longitudinal 

 slits, conspicuous ; teliospores ellipsoid or obovoid, 14-19 by 21-34 ju, rounded, truncate, or 

 obtuse above, usually narrowed below; wall smooth, cinnamon-brown, often paler below, 

 rather thin, 1-1.5 /x, the apex much thicker, 3-7 /n ; pedicel slender, tinted, about length of 

 spore. 



On Poaceae : 



Panicularia septenirionalis (Hitchc.) Bicknell {Glycerza fluitans A. Gray, not R. Br., 6-. 

 sepientrionalis Hitchc), Illinois, Indiana, Wisconsin. 



Panicularia acutifiora (Torr.) Kuntze {Glyceria acutifiora Torr.), Rhode Island. 

 Type locality; Oregon, Illinois, on Gly ceria fluitans, \^\.^r^^X^X'a.\\\\^^to\i^G. sepientrionalis. 

 Distribution : Central Atlantic coast, and from Indiana and Illinois northward. 

 Exsiccati : Kllis & Kv. N. Am. Fungi 2718. 



14. Nigredo Hordei (Tracy) Arthur. 



Uromyces Hordei Tracy, Jour. Myc. 7 : 281. 1893. 

 Caeomurns Hordei Kuntze, Rev. Gen. 3^ : 450. 1898. 



O and I. Pycnia and aecia unknown. 



II. Uredinia chiefly epiphyllous, scattered, oblong or linear, 0.5-1 mm. long, rather 

 early naked, pulverulent, cinnamon-brown, ruptured epidermis conspicuous ; urediniospores 

 broadly ellipsoid, 16-24 by 22-29^ ; wall yellowish, 1.5-2^ thick, finely and closely verru- 

 cose-echinulate, the pores 8-10, scattered, rather obscure. 



III. Telia chiefly hypophyllous, scattered, oval or oblong, 0.2-1 mm. long, long covered 

 by the epidermis, dark grayish-black ; teliospores angular-obovoid or cuneiform, 15-25 by 

 26-32 ju, rounded or angular at apex, usually narrowed below; wall chestnut-brown, moder- 

 ately thin, 1.5-2 m, thicker at apex, 3-6 ju, smooth ; pedicel nearly or quite colorless, slender, 

 about length of spore or shorter. 



On Poaceae : 



Festuca octofiora Walt. {F. tenella Willd.), Mississippi, Texas. 



Hordeuni, nodosum L. {H. pratense Huds. ), California. 



Hordeum pusillum Nutt., Kansas, Louisiana, Nebraska, Texas. 

 Typr locality : New Orleans. Louisiana, on Hordeum ^' pratense,^'' error for H. pusillum.. 

 Distribution : Nebraska to Mississippi and Texas, and the coast of central California. 

 Exsiccati : Ellis & Ev. Fungi Columb. 1796, 1895; Sydow, Ured. 1803, 1804; Seym. & Earle, 

 Econ. Vving\538. 



15. Nigredo mystica Arthur. 



Uromyces mysticus Arth. Bull. Torrey Club 38 : 377. 1911. 

 O and I. Pycnia and aecia unknown. 



