CLINTON: NORTH AMERICAN USTILAGINEAE. 
439 
distinct from the species described here. This description is based 
on two collections made by Long, but as the spores have somewhat 
the appearance of being immature, it may be that the description 
will need some slight changing with further study of the fungus. 
It is closely related to Tilletia buchloeana but apparently differs in 
the slightly larger lighter colored spores with more prominent tuber¬ 
cles and in the character of the hyaline membrane. The spores 
have not been germinated. Literature : 29. 
Tilletia Wilcoxiana Griff. 
Tilletia Wilcoxiana Griff., Bull. Torr. Bot. Club, 31 : 88. 1904. 
Sori in the ovaries, usually showing through the basal parts of the 
glumes, about 1.5-2.5 mm. in length, ovoid to ellipsoidal, frequently 
somewhat flattened, covered by plant membrane that usually bears 
the styles at its apex, upon rupture disclosing reddish brown spore 
mass; spores slightly tinted (appearing as if immature), with evi¬ 
dent hyaline enveloping membrane, subspherical to spherical, thick 
walled with tubercles showing prominently at margin, 18-22 jx in 
diameter. 
Host: Stipa emine7is var. Andersoni, Calif, (type). 
Mr. E. A. Wilcox first reported this smut, without name, in Bot. 
Gaz., 34 : 66, in 1902, where he states that Vasey’s Stipa Hassei, as 
shown by the type specimens in the National herbarium, is merely 
Stipa eminens var. Andersoni deformed by a smut. This smut has 
recently been described by Griffiths from these specimens. It is 
questionable, however, if it is distinct from Tilletia hypsophila 
described by Spegazzini on species of Stipa from South America 
(Anal. Mus. Nac. Buenos Aires, iii, 8 : 59. 1902). Spegazzini’s 
description gives the South American specimens darker colored and 
slightly smaller spores. This lighter color of the North American 
spores, however, may be due to their immaturity. 
Tilletia buchloeana Kell. & Sw. 
Tilletia buchloeana Kell. & Sw., Journ. Myc., 5: 11-12. 1889. 
Sori in ovaries, ovoid, 1-2 mm. in length, showing between or 
often concealed by enveloping glumes, with dark reddish brown 
spore mass ; sterile cells hyaline, subcircular, with very thick lamel- 
