1921] 
ROSEN—TILLETIA TEXANA IN MISSOURI 359 
characteristic hyaline membrane the spores of this smut also are 
light-colored as well as possessing other features in common with 
T. texana. The differences as noted in material in the herbarium 
of the Missouri Botanical Garden (collected by H. E. Hasse at 
Los Angeles, Cal., April 5, 1895) are in the smaller markings 
and in the somewhat smaller-sized spores of T. Wilcoxiana. 
Whether these differences denote unlike species or merely in- 
fluences of unlike hosts on the same species is a question. With- 
out a larger number of collections and without cross-inoculation 
experiments it would perhaps be best to consider them as two 
distinct species. 
