CLINTON: NORTH AMERICAN USTILAGINEAE. 
357 
Its distribution is undoubtedly more extended than that reported 
here. Kellerman and Swingle, and later Norton described the ger¬ 
mination of the spores. Literature : 129. 
Ustilago Tricuspidis Ell. & Gall. 
Ustilago Tricuspidis Ell. & Gall., Journ. Myc., 8 : 135-136. 1902. 
Sori in ovaries, ellipsoidal, about 4 mm. in length, infecting an 
occasional spikelet and showing between the spreading glumes; 
spores medium reddish brown, ovoid to chiefly subspherical or 
spherical, rather prominently verruculo-echinulate, chiefly 8-11 p in 
length. 
Host: Tricuspis seslerioides , Mo. (type), W. Va. 
This smut was collected by M. B. Waite at Charleston, Mo., in 
the fall of 1889. It is related to Ustilago spermopliora but the 
spores are more regular, more prominently verruculo-echinulate and 
darker colored. Its germination is not known. Literature : 29. 
Ustilago minor Nort. 
Ustilago minor Nort., Trans. Acad. Sci. St. Louis, 7 : 238. 1896. 
Sori on the leaves and leaf sheaths, forming ovoid to linear pus¬ 
tules, 1-5 mm. or even longer, with the covering membrane at 
maturity becoming ruptured and the dusty black brown spore mass 
scattered ; spores light to medium dark reddish brown, chiefly ovoid 
to spherical, minutely echinulate, mostly 7-9 p in length. 
Host: Bouteloua hirsuta, Ivans, (type). 
This species occurs on the same host genus, Bouteloua, as does 
Ustilago Hieronymi. It also has the same kind of sori but differs 
from that species in its decidedly smaller spores. Norton described 
the species from very meager material collected in Kansas. The 
writer is indebted to Professor Roberts of the Kansas agricultural 
college for the privilege of examining the type material. Recently 
Griffiths in his West American Fungi has referred several of his col¬ 
lections to this species, but to the writer they seem more properly to 
come under Ustilago Hieronymi. The line separating the two 
species, however, is rather hard to determine. Norton has reported 
the germination of the spores. Literature : 129. 
