58 NORTH AMERICAN FLORA [Volume 7 



10. Urocystis Agropyri (Preuss) Schrot. Abh. Schles. Ges. Abth. 



Nat. Med. 1869-72 : 7. 1870. 



Uredo Agropyri Preuss, in Sturm, Deuts. Fl. III. 25 : 1. 1848, 

 Urocystis Preitssii Kiihn ; Rab. Fungi Eur. 1898. 1874. 



Urocystis Utii Magn. ; Rab. Fungi Eur. 2390. 1878. (Type from Germanj^ on Poa pratensis angus- 

 tifotia.) 



Urocystis occulta Triiici Ellis, N. Am. Fungi 293. 1879. 



Urocystis Festucae Ule, Abh. Bot. Ver. Prov. Brand. 25 : 215. 1884. (Type from Germany, on 

 Pestuca ovina.) 



Sori in various parts, most commonly in leaves, forming striae a few mm. to length of 

 leaf, distinct or covering surface of leaf, at first lead-colored and protected by epidermis 

 but soon rupturing and reddish-brown spores becoming scattered ; spore-balls oblong to 

 subspherical, 16-32 fi in length; sterile cells hyaline to yellowish, oblong to subspherical , 

 usually completely covering fertile cells, outer wall apparently thin and by collapsings 

 with age giving ridged effect to the covering ; spores 1 or 2, rarely 3 or 4 in a ball, red- 

 dish-brown, oblong to subspherical, often with flattened sides, smooth, 11-18 fi in length. 



On Poaceae : 



Agropyron divergens, Washington. 



Agropyron occidentale, New Mexico. 



Agropyron repens, Connecticut, Massachusetts, Vermont. 



Bromus ciliatus, Iowa. 



Bromus sp., Minnesota. 



Calamagrosiis canadensis, Oregon. 



JElymus arenarius, Greenland. 



Elymus canadensis, Illinois, Iowa, Kansas, Missouri, Nebraska, Wisconsin. 



Elymus robustus, Iowa. 



Elymus virginicus, Illinois, Wisconsin. 



Elymus sp., Colorado, Minnesota. 

 Type locality : Hoyerswerda, Germany, on Agropyron repens. 



Distribution : New England to New Mexico, Oregon, and northward ; also in Europe. 

 Illustrations : Bull. Iowa Agr. Exp. Sta. 54 : /. 120 {10, 13) ; Bull. Soc. Nat. Mosc. 40i : pi. 3, 

 f.28. 



Exsiccati: Seym. & Earle, Econ. Fungi 99, 100, C56, C57, C 58 ; Ellis, Ev. & Barth. Fungi 

 Columb. 1988; Sydow, Ust. JJP; Griff. West Am. Fungi 222; Ellis, N. Am. Fungi 29i. 



11. Urocystis Junci I^agerh. Bot. Notiser 1888 : 201. 1888. 



Sori in the culms, filling the interior, eventually rupturing and disclosing a dusty brown- 

 black spore-mass ; spore-balls variable, chiefly of 1-8 spores but rarely of more, 16-36 /i, or 

 occasionally 50 /i, in length; sterile cells dark reddish-brown, easily collapsing and then 

 showing as a prominent reticulate envelope completely covering the spores, about 5-9 ^i in 

 diameter ; spores reddish-brown, chiefly subspherical or occasionally somewhat flattened 

 through pressure and then more elongate, 11-16/^ in length. 



On Juncaceae : 



Juncus balticus, Nevada. 

 Type locality: Near Pontresina, Switzerland, on Juncus Jiliformis . 

 Distribution : Nevada ; also in Europe. 

 Exsiccati : Griff. West Am. Fungi 221. 



12. Urocystis granulosa Clinton, Jour. Myc. 8 : 151. 1902. 



Sori in the spikelets, ovoid or oblong, about 5-10 mm. in length, chiefly confined to 

 the inner parts but showing through the more or less infected glumes, forming a granular 

 black spore-mass ; spore-balls reddish- to black-brown, ovoid to spherical, not easily rup- 

 tured, chiefly 28-50 /i in length; sterile cells reddish-yellow, ovoid to subspherical, com- 

 pletely covering the spores, often somewhat indefinite in appearance through the collapsing 

 of the outer wall, about 8-13 fi in length ; spores dark reddish-brown, ovoid to spherical, or 

 polyhedral through pressure, smooth, 1-6 or rarely more in a ball, about 13-19 fi in length. 



On Poaceae : 



Stipa comata, Idaho. 

 Type locality : Idaho, on Stipa comata. 

 Distribution : Known only from the type locality. 



