[Vor. 8 
358 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
the spores show a small apiculus which at times is replaced by a 
slender thread-like, colorless hypha. This apiculus or slender 
thread simulates the aspects of a pedicel; at any rate, it is quite 
likely to be the point of attachment to the stromatie mass. 
Some of Lutman's figures (Trans. Wis. Acad. Sci. 16: 1191-1244. 
1910), depicting the manner in which resting spores are developed 
in some smuts, would indicate that some such method of attach- 
ment of spore to the stroma is not uncommon. May this be re- 
garded as a step culminating in the development of a true pedicel 
such as numerous rusts possess? 
In Clinton's description it will be noted that he is not certain 
of the maturity of his material, and particularly in connection 
with the light orange-yellow color of the spores, he says: “ Ap- 
pearing as if somewhat immature." "The Missouri material shows 
the same color and in the mind of the writer there is little doubt 
of the maturity of this material. In this region Hordeum pusillum, 
the host, is one of the grasses which appears early and usually 
matures during May or the first half of June. By the end of 
June this grass begins to disappear and is gradually supplanted 
by later developing grasses. As Demetrio's collection was made 
on June 20, there is little doubt that the host as well as the fungus 
must have reached maturity. The fact that other smuts, closely 
related to this species, are also light-colored should leave little 
doubt on this matter. 
The relationship of Tilletia texana to other species is worthy 
of consideration. Besides this species four others of the genus 
Tilletia have been described on various species of Hordeum. 
They are T. Hordei Kórn., T. Trabuti Jacz., T. Panicicii Bub. & 
Ranojevic, and T. Bornmülleri Magn. Clinton has already 
called attention to the difference between T. texana and T. Hordei, 
namely, the reticulate markings of spores of the latter species. 
The other species likewise are said to have reticulate spores 
besides other diagnostic characters which are not possessed by 
T. texana. Indeed, species on other host genera show greater 
similarity to this smut. Besides T. buchloena, mentioned by 
Clinton, T. Wilcoriana Griffiths and perhaps T. Rauwenhoffii 
Fisch. de Waldh. are closely related. Tilletia Wilcoxiana on 
Stipa Hassei in particular deserves attention. Besides the 
