Part 3, 1912] AECIDIACBAE 239 



On Juncaceae : 



Juncus balticus Willd., California, Colorado, Idaho, Kansas, Montana, Nebraska, North 



Dakota, South Dakota, Washington, Wyoming. 

 Juncus Lescurii Boland., California. 



Juncus me xicanusWiim. (/. compressusW\\\d.,)y California: Mexico (state). 

 Juncus texiilis Buchenau, California. 

 Type LOCALITY : France, on Juncus sylvaiicus. 



Distribution : North Dakota to Kansas and westward to the Pacific coast southward to 

 central Mexico. 



Illustration : Beitr. Krypt. Schweiz 22 : / 43. 



KxsicCATi: Clements, Crypt. Form. Colo. 5J7; D. Griff . W. Am. Fungi 36, 374: Brenckle, 



'^^^^^ '^^^•20,26,51; Sydow,Ured. 1701,2253; Carleton, Ured. Am. 23; Earth. Fungi Columb. 

 3296, 3593 . 



35. Nigredo Silphii (Burrill) Arthur. 



Aecidium compositarum Silphii Burrill ; De-Toni, in Sacc. Syll. Fung. 7 : 798. 1888 

 Aecidium Silphii Sydow, Ured. 1546. 1901. 

 Uromyces Silphii Arth. Jour. Myc. 13 : 202 1907. 

 Uromyces Junci-le?iuis Sydow, Monog. Ured. 2 : 289. 1910. 



0. Pycnia chiefly epiphyllous, in small groups, golden-brown, subglobose, 80-100 ju 

 broad by 80-110 /n high ; ostiolar filaments hyaline, free, up to 65 ju long. 



1. Aecia amphigenous, in groups 4-10 mm. across, crowded about the pycnia on dis- 

 colored spots, deep-seated, short, 0.2-0.4 mm. in diameter; peridiura colorless, the margin 

 recurved, lacerate ; peridial cells rhombic, 20-28 /x across, the outer wall thick, 6-8 /li, trans- 

 versely striate, the inner wall thinner, 4-6 ju, moderately verrucose ; aeciospores angularly 

 globoid, small, 13-18 ju in diameter ; wall colorless, thin, about Iju, minutely verrucose. 



On Carduaceae : 



Silphium integrifolium Michx., Illinois, Missouri, Wisconsin. 



Silphium laciniatum L., Illinois, Iowa, Kansas. 



Silphium p erf oliaium I^., Indiana, Iowa, Wisconsin. 



Silphium, ierebinthinaceum Jacq., Illinois, Missouri, Ohio, Wisconsin. 



II. Uredinia amphigenous, scattered, roundish or somewhat elongate, small, 0.2-0.3 

 mm. wide by 0.3-0.5 mm. long, tardily naked, dark cinnamon-brown, ruptured epidermis 

 not conspicuous ; urediniospores broadly ellipsoid or sometimes obovoid, 13-19 by 15-23 /l* ; 

 wall golden-yellow, about 1.5 m thick, sparsely and bluntly echinulate, the pores 2, super- 

 equatorial . 



III. Telia amphigenous, scattered, roundish or somewhat elongate, small, 0.2-0.3 mm. 

 wide by 0.2-0.6 mm. long, finally naked, firm, somewhat pulvinate, blackish-brown, rup- 

 tured epidermis noticeable ; teliospores angularly obovoid, rounded, truncate or occasion- 

 ally pointed above, usually narrowed below, 12-19 by 26-35 y.\ wall chestnut-brown, 1.5-2jLt 

 thick, much thicker above, 7-10 /z, smooth ; pedicel light chestnut-brown, one to one and a 

 half times length of spore. 



On Juncaceae : 



Juncus dichotomus EH., Delaware, Florida, Georgia, New Jersey. 



Juncus Dudleyi Wiegand, Colorado, Indiana, Nebraska, Washington. 



Juncus Greenei Oakes & Tuck., Connecticut. 



Juncus interior ^i&^dind., Colorado, Illinois, Iowa, Nebraska, New Mexico, South Dakota, 



Juncus longistylis Torrey, Colorado, Idaho, Montana, Nebraska, Washington, Wyoming ; 

 Manitoba. 



Juncus marginatus Rostk., Nebraska. 



Juncus setosus (Cov.) Small, Nebraska. 



Juncus tenuis Willd., Delaware, Indiana, Iowa, Kansas, Kentucky, I^ouisiana, Maine, 

 Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New York, North Carolina, 

 North Dakota, South Dakota, Texas, Virginia, Washington, West Virginia, Wisconsin ; 



Ontario. 

 Type locality : Mcl^ean county, Illinois, on Silphium integrifolium. 

 Distribution : Sierra Nevada and Cascade Mountains eastward through the United States 



and Canada to the Atlantic coast. . ^^ ^^o r^ ^ -tt ^ 



Exsiccati : Brenckle, Fungi Dak. 21; Seym. & Earle, Econ. Fungi 52,528; Sydow, Ured. 

 1546 2106; Ellis & Ev. Fungi Columb. 1478; Barth. Fungi Columb. 9394, 2595, 2796, 2800, 3094, 

 JCP5;Rab.-Wint.-Paz. Fungi Eur. J&^J^/D. Griff. W. Am. Fungi ^•/■/; Vesterg. Micr. Rar. Sel. (526. 



Z6. Nigredo Junci-effusi (Sydow) Arthur. 



Puccinia Junci Schw. Trans. Am. Phil. Soc. II. 4 : 295. 1832. Not P.Junci Desmaz. 1825. 

 Uromyces effusus Arth. Jour. Myc. 13 : 193. 1907. Not U. effusus De-Tom, 1888. 

 Uromyces Junci-effusi Sydow, Monog. Ured. 2 : 290. 1910. 



