350 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
Sori in spikelets, usually infecting only the parts within the glumes 
but sometimes also destroying the base of these, often at first agglu¬ 
tinated but finally becoming dusty ; spores usually dark reddish 
brown, chiefly ovoid to spherical but occasionally polyhedral or 
irregular, sometimes apparently smooth or only granular but usually 
abundantly but minutely granular-verruculose, 7-11 g, rarely 14 g 
in length. 
Hosts : Bromus arvensis, Colo.; ? B. breviciristcitus, Calif., Ia.; 
B. ciliatus , Colo. ; B. BLookerianus, Calif., Wash.; B. hordeaceus , 
Calif., Wash.; B. hordeaceus var. glabrescens, Wash.; B. Kalmii , 
Utah ; B. marginatus , Calif., Colo., D. C., Ia., Ore., Wyo.; B. 
Pumpellianus , D. C. ; B. racemosus , Wash. ; B. Ricliardsonii, 
D. C.; B. secalinus, Calif., Ore. ; B. vulgaris, Mont. ; B. mdgaris 
var. eximius , Wash. ; Bromus sp., Utah. 
An examination of the type of Cintractia Patagonica shows it to 
be only an unusually vigorous form infecting the basal parts of the 
outer glumes as well as the inner parts. A specimen in the Farlow r 
herbarium has this same character and one finds all gradations 
between these and those that have their spore mass entirely hidden. 
Ustilago bromivora is closely related to Ustilago Holwayi though 
the appearance of the sori is quite different. Kuhn, Brefeld, and 
Plowright have reported the germination of this smut. Literature : 
20, 73. 
Ustilago bromivora var. macrospora Fail. 
Ustilago bromivora var. macrospora Farl., Bull. Ia. Agr. Coll., Bot. Dep., 
1886: 59. 1887. 
Similar to the species except spores somewhat more irregular and 
larger, chiefly 11-17 g in length. 
Host: Bromus ciliatus , Colo, (type), ? Ia. 
This seems entitled only to varietal rank though having spores 
much larger than those ordinarily possessed by the species. On this 
same host there is a specimen in the Farlow herbarium, also from 
Colorado, that has spores but slightly larger than those of the species. 
While the germination of this variety has not been reported, it is 
probably the same as that of the species. 
