CLINTON: NORTH AMERICAN USTILAGINEAE. 
385 
Host: Setaria sp., Mex. 
Spegazzini first mentioned this in his Fungi Arg., pug. 2, no. 24, 
under the name of Ustilago Setariae Niessl? In his Fungi Guar., 
in 1886, he recognized it as distinct from that species and suggested 
the name Ustilago pamparum , and the next year, in his Fung. 
Patag., page 26, he re-described it under this name. The Mexican 
specimen was compared with the South American form and found 
to be the same. Apparently the germination of this species has not 
been reported. 
Sphacelotheca diplospora (Ell. & Ev.) Clint. 
Ustilago diplospora Ell. & Ev., Journ. Myc., 6 : 119. 1891. 
Sphacelotheca diplospora Clint., Journ. Myc., 8 : 140. 1902. 
Sori in the ovaries of only part of the spikelets, rather inconspicu¬ 
ous, showing between the spreading glumes which they rarely ex¬ 
ceed in length, with evident false membrane that soon ruptures and 
discloses olive black dusty spore mass ; false membrane easily sep¬ 
arated into hyaline or slightly tinted generally subspherical cells 
which are also somewhat scattered in the spore mass and are slightly 
larger than the spores ; spores often mechanically adhering in irreg¬ 
ular masses, reddish brown, occasionally ovoid but chiefly subspheri¬ 
cal or polyhedral, abundantly but minutely verruculose, 8-12 /x in 
length. 
Hosts: Panicum Crus-galli, Ill.; P. sanguinale, Miss. (type). 
The irregular spore masses sometimes found give this somewhat 
the aspect of a Sorosporium. The spores are very similar to those 
of /S. pamparum , but the cells of the false membrane and the gen¬ 
eral appearance of the sorus are different. The sterile cells are evi¬ 
dently the second kind of spores described by Ellis and Everhart in 
their original description. This is another species whose germina¬ 
tion has not yet been described. Literature : 181. 
Sphacelotheca Sorghi (Lk.) Clint. 
Sporisorium Sorghi Lk., Sp. PL, 6 2 : 86 . 1825. 
Tilletia Sorghi-vulgaris Tul., Ann. Sci. Nat., Bot., in, 7 : 116. 1847. 
Tilletia Sorghi Auct. 
Ustilago Sorghi Pass., Hedw., 12 : 114. 1873. 
Ustilago Tulasnei Kuhn, Sitz. Nat. Ges. Halle, 1874 . 
