CLINTON: NORTH AMERICAN USTILAGINEAE. 
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gonis-hirtifolii. In fact some of the specimens here reported from 
Mexico have spores almost as distinctly minutely verruculose as 
that species has but the spores are smaller. Sphacelotheca Paspali- 
notati is also very closely related. Ustilago cylindrica Pk. does 
not seem to be distinct. Brefeld has described the germination of 
the spores. Literature : 20, 47, 175, 198. 
Sphacelotheca Paspali-notati (P. Henn.) Clint. 
Ustilago Paspali-notati R. Henn., in Herb. Holway, see Journ. Myc., 8 : 
140. 1902. 
Sphacelotheca Paspali-notati Clint., Journ. Myc., 8: 140. 1902. 
Sori in the inflorescence, linear, about 4-6 cm. in length, with 
evident false membrane gradually flaking away from apex and 
exposing reddish brown dusty spore mass surrounding evident 
often forked columella; sterile cells hyaline, with those of the 
membrane adhering rather firmly, with loose ones in roundish 
clusters, usually larger than the spores ; spores light reddish brown, 
ovoid to spherical or slightly angled, apparently smooth but very 
minutely verruculose, 7-10 p in length. 
Host: Paspalum notatum , Mex., Guadalajara (type). 
This species is very near Sphacelotheca Ischaemi , in fact it is 
scarcely to be distinguished from the verruculose forms of that 
species though it has a more luxuriant sorus and a different host. 
Its germination is not known. 
Sphacelotheca Andropogonis-hirtifolii (P. Henn.) Clint. 
Ustilago Andropoginis hirtefolii P. Henn., Bot. Gaz., 28 : 274. 1899. 
Ustilago Andropogonis-saccharoidis P. Henn., Syd. Ust., 251. 1901. 
Sphacelotheca Andropogonis-hirtifolii, Clint., Journ. Myc., 8 : 141. 1902. 
Exsiccati : Ustilago Andropogonis-hirtifolii, on Andropogon hirtifolium 
var. pubiforium, Syd., Ust., 201; Ustilago Andropogonis-saccharoidis, on 
Andropogon saccharoides , Syd., Ust., 251. 
Sori involving the entire inflorescence, elongated, usually 5-9 cm. 
in length (rarely in the individual spikelets and then shorter), at 
first enveloped by the leaf sheath, with prominent false membrane 
that gradually flakes away disclosing the at first agglutinated but 
finally dusty olive black spore mass, with prominent often forked 
columella; sterile cells hyaline, with those of membrane adhering 
