18 NORTH AMERICAN FLORA [Volume 7 



Type locality : Near City of Mexico, Mexico, on Aegopogon cenchroides. 

 Distribution : Arizona and Mexico. 



49. Ustilago Hilariae Ellis & Tracy, Jour. Myc. 6 : 77. 1890. 



Uredo Hilariae Sacc. Syll. Fung. 9 : 333. 1891. 



Sori in the inflorescence and somewhat in the enveloping leaves, usually elongate, 0.5- 

 1.5 cm. in length, covered by a thin whitish membrane through which the dark spore- 

 mass shows, or hidden entirely by unaltered enveloping parts; spores light reddish-brown, 

 usually subspherical or spherical or occasionally ovoid, minutely echinulate, chiefly 13-17/^ 

 ill length. 



On Poaceae : 



Hilaria Jamesii , Colorado, New Mexico. 



Hilaria mutica^ Arizona. 

 Type locality : Albuquerque, New Mexico, on Hilaria Jamesii. 

 Distribution : Colorado, New Mexico, and Arizona. 



50. Ustilago Mulfordiana Ellis & Ev. Bull. Torrey Club 22 : 362. 1895. 



Tilletia mixta Massee, Kew Bull. 1899: 145,^.^. 1899. 



Ustilago Festucae-tenellae P. Henn. Hedwigia Beibl. 41: 61. 1902. (Type from Mexico, on Fes- 

 tuca tenella.) 



Sori in the inflorescence (often destroying only basal part) and the enveloping leaves, 

 elongate, usually 1-2 cm. in length, covered by the thin whitish epidermis or by the less 

 altered opaque parts; spores nearly opaque, dark reddish-brown, ovoid to spherical or 

 somewhat irregular, when dry laterally compressed, rather coarsely though obscurely ver- 

 ruculose, chiefly 12-16 ^, occasionally even 18 yti, in length. 



On Poaceae : 



Festuca microstachya, Washington. f"^ 



Festuca octoflora {F. tenella), Arizona, Idaho, Montana, Oregon, tJtahy Washington, 



Wyoming ; Mexico. wC.— 



Festuca sp., California, Idaho. < 



Type locality : Near Bois^ City, Idaho, on Festuca sp. 

 Distribution : Montana to Washington and Mexico. 



ExsiCCATi : Bllis & Bv. N. Am. Fungi 1895 ; Seym. & Barle, Econ. Fungi C 76; Griff. 

 West Am. Fungi 229, 229^, 230. 



51. Ustilago elegans Griff. Bull. Torrey Club 29: 292. 1902. 



Sori in the inflorescence, hidden by leaves and sheaths, sometimes showing through 

 at the base, with a dusty black-brown spore-mass through which remains of the inflor- 

 escence are distributed as slender threads ; spores dark reddish-brown, ovoid to chiefly 

 spherical, minutely and rather obscurely verruculose, 10-14 ^u in diameter. 



On Poaceae : 



Chloris elegans, Arizona. 

 Type locality : Cochise, Arizona, on Chloris elegans. 

 Distribution : Arizona. 



Illustration : Bull. Torrey Club 29 : 291,/ 3. 

 ExsiCCATi: Griff. West Am. Fungi J^9. 



52. Ustilago Dieteliana P. Henn. Hedwigia 37 : 268. 1898. 



Sori very elongate, often 1 or more dm. in length, at apex of culm, enveloped by leaves 

 and leaf-sheaths, apparently infecting inner leaves as well as inflorescence and changing 

 these into elongate shredded filaments scattered among the at first agglutinated but finally 

 dusty olive-black spore-mass ; spores dark reddish-brown, chiefly ovoid or ovate to spherical, 

 rather prominently verruculose, 9-14 !i in length. 



On Poaceae : 



Tripsacum dactyloides, Mexico. 

 Type locality : Near City of Mexico, Mexico, on Tripsacum dactyloides. 

 Distribution: Mexico. 

 ExsiCCATi : Sydow, Ust. 152. 



53 . Ustilago striaeformis (Westend.) Niessl, Hedwigia 15 : 1. 1876. 



Uredo striaeformis Westend. Bull. Acad. Roy. Belg. 182 ; 406. 1851. 



Tilletia Debaryana Fisch. de Waldh. ; Rab. Fungi Kur. 1097. 1866. (Type from Europe, on 



Holcus mollis.) 

 Tilletia striaeformis Oud. Bot. Zeit. 36 : 441. 1878. 



