368 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
not seem to differ from the type. They differ decidedly from 
Ustilago Hilariae. 
Ustilago Hilariae Ell. & Tr. 
Ustilago hilariae Ell. & Tr., Journ. Myc., 6 : 77. 1890. 
Uredo Hilariae Sacc., not Ell. & Tr., Syll. Fung., 9 : 333. 1891. 
Sori in the inflorescence and somewhat in the enveloping leaves, 
usually elongated, 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 p in length. 
Hosts : Hilaria Jamesii , Colo., N. Mex. (type) ; H. mutica, Ariz. 
Through some error Saccardo printed the description of this 
species under the name Uredo Hilariae Ell. & Tr. Later, Hen¬ 
nings described a different smut on Hilaria as Ustilago Hilariae ,, 
evidently not knowing that this name had already been used by 
Ellis & Tracy. The fungus described here has some resemblance to 
Ustilago Mulf ordiana and U Aegopogonis , differing in its lighter 
colored more finely echinulate spores. Its germination has not 
been reported. 
Ustilago Mulfordiana Ell. & Ev. 
Ustilago Mulfordiana Ell. & Ev., Bull. Torr. Bot. Club, 22 : 362. 1895. 
TiUetia mixta Mass., Kew Bull., 153-154 : 145. 1899. p. p. 
Ustilago Festucae-tenellae P. Henn., Hedw., Beibl., 41 : 61. 1902. 
Exsiccati: TiUetia fusca Ell. & Ev., on Festuca sp., Ell. & Ev., N. A. 
Fungi, 1895 ; Ustilago Mulfordiana Ell. & Ev.,on Festuca tenella, Seym. & 
Earle, Econ. Fungi Clinton Ust. Supp., C 76, Griff., West Amer. Fuiwi 
229, 229a, 230. 
Sori in the inflorescence (often destroying only basal part) and 
the enveloping leaves, elongated, 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 verruculose, 12-18 p in length. 
Hosts : Festuca microstachya , Wash. ; F. tenella , Ariz., Ida., 
Mont., Ore., Wash., Wyo.; Mex. ; Festuca sp., Calif., Ida. (type). * 
