240 NORTH AMERICAN FLORA [V01.UME 7 



O and I. Pycnia and aecia unknown. 



II. XJredinia amphigenous, scattered, oblong or linear, 0.1-0.3 mm. wide by 0.3-1.5 

 mm. long, tardily naked, dark cinnamon-brown, ruptured epidermis very conspicuous ; 

 urediniospores broadly ellipsoid, 14-19 by 18-26ju (western forms 16-24 by 21-29/i) ; wall 

 yellow to light cinnamon-brown, about 1.5 ju thick (western forms about 2/x), moderately 

 verrucose-echinulate, the pores 3 or 4, equatorial. 



III. Telia amphigenous, numerous, scattered, oblong or linear, 0.2-0.5 mm. wide by 

 0.3-2 mm. or more long, rarely confluent, finally naked, ruptured epidermis very con- 

 spicuous ; teliospores obovoid or broadly ellipsoid, 13-23 by 24-40 /z, obtuse or rarely acute 

 at apex, usually narrowed below ; wall chestnut-brown, 1.5-2 ju thick, much thicker above, 

 6-10 M) smooth; pedicel tinted, about as long as the spore. 



On Juncaceae : 



Juncus effusus Iv, Delaware, Maryland, Massachusetts, Missouri, New Jersey, New 

 York, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, West Virginia. 

 Ju7icus ensifolius^Ni^stv., California, Montana, Oregon, Washington. 

 Juncus filiforwiis L., Nova Scotia. 

 Juncus nevadensis S. Wats., California. 

 Juncus orthophyllus Cov., Oregon, Washington. 

 Juncus oxymerisV^Vi%€i.ra..^ California, Oregon. 

 Juncus phaeocephalus Engelm., California. 

 Juncus saxhnontanus A. Nels., Utah. 

 Juncus Suksdorfii Piper, Washington. 



Juncus xiphioides E- Meyer, California ; British Columbia. 

 Type LOCALITY : Bethlehem, V^unsylv^rA'A., ow. Juncus effusus. 



Distribution : Nova Scotia to South Carolina, and westward to British Columbia and Cali- 

 fornia; rare in the interior of the continent. 



ExsiCCATi : Ellis & Ev. Fungi Columb. 339 ; Barth. Fungi Colurab. 2991; ElHs, N. Am. Fungi 

 238; Shear, N. Y. Fungi 76; Kellerm. Ohio Fungi J",?; Rav. Fungi Am. 51; Garrett, Fungi 

 Utah. 149, 198; Sydow, Ured, 1760, 1904; D. Griff. W. Am. Fungi J7J. 



37. Nigredo Zygadeni (Peck) Arth. Result. Sci. Congr. Bot. 



Vienne 344. 1906. 



Uromyces Zygadem Peck, Bot. Gaz. 6 : 239. 1881. 

 Caeom-urus Zygadeni Kuntze, Rev. Gen. 3^ : 451. 1898. 

 Uromyces Fraserae Arth. & Ricker, Jour. Myc. 8 : 128. 1902. 



0. Pycnia amphigenous, gregarious, punctiform, honey-yellow, inconspicuous, im- 

 mersed, small, globoid, 85-115m wide; ostiolar filaments 40-50 /z long. 



1. Aecia amphigenous, indefinitely grouped, often crowded, cupulate, short, 0.2-0.3 

 mm. in diameter ; peridium delicate, the margin erect, lacerate; peridial cells rhomboidal, 

 19-26 /i long, somewhat overlapping, the outer wall transversely striate, rather thick, 4-6/:*, 

 the inner wall finely verrucose, somewhat thinner; aeciospores globoid, 16-23 by 19-28//; 

 wall pale-yellow, rather thin, 1-1.5 ju, finely and closely verrucose. 



II. Uredinia amphigenous, scattered, roundish or elliptical, about 0.5 mm. across, soon 

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

 broadly ellipsoid or obovate-globoid, 19-25 by 21-31 ju ; wall yellow, rather thin, 1.5-2 /x, 

 finely and closely verrucose-echinulate, the pores 6-8, scattered. 



III. Telia amphigenous, scattered, roundish, 0.3-0.5 mm. across, tardily naked, 

 bullate, blackish -brown ; teliospores obovoid, angular and somewhat irregular, 19-26 by 

 25-33 ju, the apex rounded or truncate, the base narrowed; wall chestnut-brown, 2.5-3^ 

 thick, not or only slightly thickened above ; pedicels lightly tinted, slender, about length 

 of spore. 



On Melanthaceae : 



Anticlea elegans (Pursh) Rydb. {Zygadenus elegans Pursh), Colorado, Wyoming. 

 Toxicoscordion falcaium Rydb. {Zygadenus falcatus Rydb.), Colorado, Utah. 

 Toxicoscordion Frevtonti (Torr.) Rydb. {Zygadenus Frentonti Torr.), California. 

 Toxicoscordion intermedium Rydb. {Zygadenus iniermedius Rydb.), Montana, Wyoming. 

 Toxicoscordion Nuttallii (A. Gray) Rydb. {Zygadenus Nuitallii S. Wats.), Kansas. 



Toxicoscordion panictilatum (Nutt.) Rydb. {Zygadenus paniculaius S.VJ^Xs.), Utah. 

 Type locality: Utah, on Zygadenus panicu la tus. 



Distribution : Throughout the Rocky Mountains and extending to the plains in central Kan- 

 sas and to near the coast in California. 



ExsicCati : Ellis & Ev. N. Am. Fungi 1872, 1873, 1874; Sydow, Ured. 1765. 



