Part 3, 1912] AECIDIACBAH 229 



II. Uredinia chiefly epiphyllous, scattered, oblong or linear, 0.5-1.2 mm. long, rather 

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

 broadly ellipsoid, 24-28 by 27-32 /x; wall golden -yellow, moderately thick, 2-2.5 m, finely 

 and inconspicuously echinulate, the pores 8-12, scattered. 



III. Telia chiefly hypophyllous, scattered, 0.2-1 mm. long, long covered by the epidermis, 

 grayish-black ; teliospores angularly obovoid, 18-26 by 26-33 /*, rounded or angular above, 

 rounded or somewhat narrowed below ; wall chestnut-brown, moderately and uniformly 

 thick, 2-2 5 /i, finely and inconspicuously verrucose ; pedicel light-yellow, one half to once 

 length of spore. 



On Poaceae : 



Hordeum juhaium I^., Colorado, "Utah. 

 Type locality : Denver, Colorado, on Hordeum jubatum. 

 Distribution : Central Rocky Mountains. 

 ExsicCATi : Earth. Fungi Columb. 3497; Earth. N. Am. Ured. 91. 



16. Nigredo Poae (Rab.) Arthur. 



Uromyces Poae Rab. (Unio Itin. Crypt. 38. 1866) ; Schrot. Beitr. Biol. Pfl. 3 : 64. 1879. 



0. Pycnia epiphyllous, in small groups 1 mm. or less across, honey-yellow becoming 

 brownish, globoid, 98-144 ;u in diameter by 90-128 ^ high ; ostiolar filaments not seen. 



1. Aecia hypophyllous, gregarious, in crowded groups 1.5-2.5 mm. across, cupulate, 

 short, 0.2-0.4 mm. in diameter ; peridium whitish, the margin spreading or slightly recurved, 

 finely lacerate ; peridial cells rhombic or rhomboidal, 26-33 /z long, the outer wall thick, 7-9 /i, 

 striate, the inner wall thinner, 3-4;*, moderately verrucose ; aeciospores subgloboid, 15-18 by 



16-22 )u ; wall yellowish or colorless, thin, about 1/x, finely verrucose. 



On Ranunculaceae : 



Ranunculus repens I^., Nova Scotia. 



II. Uredinia amphigenous, scattered, small, oval or linear, rather tardily naked ; 

 urediniospores broadly ellipsoid or obovoid, 16-20 by 21-26 )li ; wall yellowish, thin, about 

 1.5 m, finely echinulate, the pores 3-5, scattered. 



III. Telia amphigenous, scattered, small, oval or linear, brownish-black, tardily naked j 

 teliospores ellipsoid or obovate-ellipsoid, 15-19 by 24—29 /i, rounded or truncate at the apex j 

 wall light golden-brown above, lighter below, thin, 1-1.5 ju, somewhat thicker above^ 

 smooth ; pedicel colorless, as long as the spore or less. 



The species is composed of a number of races brought to light by cultures {cf. Kleb. Wirtsw.. 

 Rostp. 324. 1904-), some of which have received independent names. The somewhat uncertain 

 synonymy^ which applies chiefl}' to European forms, is not given. Uromyces Daciylidis Otth, not 

 yet found m America, is considered distinct from U. Poae {cf. Juel, Sv. Eot. Tidssk. 2: 169. 1908), 



On Poaceae : 



Poa trivialis Iv., Nova Scotia. 



Type locality ; Germany, on Poa nemoralis. 



Distribution : Nova Scotia ; also in Europe. 



Illustration : Beitr. Krypt. Schweiz 2^ : /. 55. 



17. Nigredo Epicampis (Dietel & Hoi way) Arth. Result. Sci. 



Congr. Bot. Vienne 343. 1906. 



Uromyces Epicampus Dietel & Holway ; Holway, Eot. Gaz. 24 ; 23. 1897. 



O and I. Pycnia and aecia unknown. 



II. Uredinia epiphyllous, intercostal, early naked, cinnamon-brown ; urediniospores 

 globoid, 28-32/A in diameter; wall 1.5-2^ thick, cinnamon-brown, closely echinulate, the 



pores 5 or 6, scattered. 



III. Telia epiphyllous, intercostal, oblong or linear, 0.5-1 mm. long, early naked, 



blackish-brown; teliospores globoid or broadly obovate, 20-26 by 26-35 m, rounded or 

 obtuse at both ends ; wall chestnut-brown, rather thin, 1.5 /x, thicker at apex, 5-7 ^ ; pedicel 

 firm, tinted next to spore, two to three times length of spore. 



On Poaceae : 



Epicampes macroura Eenth., Mexico (state). 

 Type locality: Eslava, near City of Mexico, Mexico, on Epicampes macroura. 

 Distribution : Central Mexico. 



Illustration: Bull. Ivab. Nat. Hist. Univ. Iowa 5: pi. l,f. 47a. 

 Exsiccati : Arth. & Holway, Ured. Exs. Ic. 47a, 



