CLINTON: NORTH AMERICAN USTILAGINEAE. 
339 
sheaths but without special covering membrane, when mature form¬ 
ing dusty dark brown spore mass ; spores ovoid to spherical, occa¬ 
sionally slightly polyhedral or irregular, smooth, often guttulate, 
chiefly 4-7 g in length. 
Hosts : Agropyrum occidental, Mont., S. Dak.; Distichlis mari- 
tirna , Ariz., Calif., N. Mex., Nev., Ore., Tex., Wash. ; Elymus Can¬ 
adensis , la.; E. eondensatus , Calif.. Nev., Ore., Wash. ; E. glaucus, 
Calif.; E. Sitanion , Wash.; E. striatus, Mont.; Oryzopsis cuspi- 
data, Colo.; Poa PucJdeyana, Nev.; Puccinellia airoides , Calif.; 
Sitanion longifolium , Calif. ; Sporobolus cryptandrus , Colo, (type 
U. Sporoboli and U. funalis) ; Sporobolus sp., Calif.; Stipa comata , 
Mont., Neb., Wash.; A. coronata , Calif.; 8. eminens , Calif.; A. 
occidentalis, Ore.; A. liichardsonii , Wyo. (type A. T Villiamsii) ; /S'. 
setigera , Calif., Tex.; A. spartea , III., S. Dak.; A. Vaseyi , N. Mex.; 
A. viridula, S. Dak.; Stipa sp., Utah, Wash. 
In some of the specimens there can be seen the circular caps that 
often split off on either side of the spores before germination. Soro- 
sporium ^Villiamsii , recently described by Griffiths, has apparently 
this condition of the spores, which are somewhat swollen, and with 
epispore more or less split open. The so called spore balls in this 
case result from a mechanical adherence of the spores in irregular 
masses, a condition often seen in smuts dried under certain condi¬ 
tions. Griffiths has called attention to the variation with which this 
smut attacks different hosts in the west. Distichlis maritima is 
sometimes very much dwarfed; Puccinellia airoides , Sitanion longi- 
folium, and Elymus glaucus sometimes have the sori in the leaf 
blades and even in the inflorescence. Winter and Brefeld have 
described the germination of this species. 
Ustilago longissima (Sow.) Tul. 
Uredo longissima Sow., Engl. Fungi, t 139. 1799. 
Uredo culmorum Schum., Enum. Plant. Saell., 2 : 233. 1803. 
Caeoma longissimum Schl., El. Berol., 2 : 129. 1824. 
Erysibe longissima Wallr., FI. Crypt. Germ., 2 : 215. 1833. 
Ustilago longissima Tul., Ann. Sci. Nat., Bot., in, 7 : 76. 1847. 
Uredo fusco-virens Ces., Klotz-Rab. Herb. Yiv. Myc., 1497. 1750. 
Ustilago jilifor mis 1 Rostr., Bot. For. Fests., 136. 1890. 
1 Rostrup holds that this species was first described by Schrank in Hoppe’s 
Bot. Taschenb., 69, in 1793, as Lycoperdon Jiliformis. 
