132 
Journal of Mycology 
[Vol. 8 
USTILAQINACE/E. 
* Spores pale to dark reddish brown (Ustilago). 
USTILAGO HYPODYTES (Schl.) Fr.— Ustilago minima 
Arth., Bull. Ia. Agr. Coll. 1884:172. 1884. Ustilago sporo- 
boli Ell. & Ev., Bull. Torr. Bot. Club 24:282. 1897. Ustilago 
funalis Ell. & Ev., Bull. Torr. Bot. Club 24:457. 1897. Soro- 
sporium williamsii Griff., Bull. Torr. Bot. Club 29:296. 1902. 
Hosts: Agropyron occidentale, Mont., S. Dak.; Distichlis 
maritima, Nev., Ore., Tex.; Elymus canadensis, Ia.; E. conden- 
satus, Nev., Ore., E. sitanion, Wash.; E. striatus, Mont.; Ory- 
zopsis cuspidata,— ; Sporobolus cryptandrus, Colo, (type U. 
sporoboli) ; Sporobolus sp., Calif.; Stipa comata, Mont., Neb.; 
Sicoronata, Calif.; S. eminens, Calif.; S. occidentale, Ore.; S. 
richardsonii, Wyo. (type S. williamsii) ; S. setigera, Calif., 
Tex.; S. spartea, Ia. (type U. minima), Ill., S. Dak.; S. virid- 
ula, S. Dak.; Stipa sp., Utah, Wash. 
When the spores of this species begin to germinate they 
often swell in size and split off a cap from the epispore or else 
crack irregularly. Sorosporium williamsii seems to be merely 
this condition of this species. The so-called spore-balls are noth- 
, ing more than a mechanical adhering of irregular masses of the 
spores that is often met with in Ustilago where the specimens 
have dried under certain conditions. 
USTILAGO LONGISSIMA (Sow.) Tub—Hosts: Gly- 
ceria arundinacea, Ia.. Minn.; G. grandis, Mass., Mich., N. Y., 
Verm.; Glyceria sp. N. H. 
The spores of the American specimens of this species average 
slightly larger than those from Europe even on the same host. 
USTILAGO LONGISSIMA var. MACROSPORA Davis. 
— Hosts: Glyoeria fluitans, Ill., Me., Wis. (type) ; G. laxa, Me. 
The form on G. laxa from Maine is somewhat intermediate 
between this and the species. 
USTILAGO MEXICANA Ell. & Ev.—Host: Muhlen- 
bergia sp., Mex. (type). 
USTILAGO HORDEI (Pers.) Kell. & Sw. Host: Hor- 
deum sp. cult. More or less commonly found where barley is 
grown. 
USTILAGO LEVIS (Kell. & Sw.) Magn.—Host: Avena 
sativa, Conn., Ia., Ill., Kans. (type), Ohio, Wis., W. Virg. 
This species is often confused with Ustilago avenae. While 
probably not so common as that species it is much more common 
than the reported distribution would indicate. 
