238 Trans. Acad. Sci. of St. Louis. 



enlarged and rounded, appearing much like young teleuto- 

 spores. 



The smut has been found well developed the last of April 

 and is probably perennial in the underground parts of the 

 host. Pustules have been found on leaves just emerging from 

 the ground. The affected parts scarcely ever send up flower 

 stalks but when they do the smut occurs in some of the 

 flowers or at the base of the spikelets.* 



22. U. minor n. sp. (Plate XXVIII. 3 ; XXIX. 5, 12.) 

 On leaves of Bouleloua hirsuta, Manhattan, rare. 



Much like the preceding but spores much smaller, 8-9 fi ; 

 contents less homogeneous. 



I have examined a large number of plants of the three 

 species of Bouteloua growing together, where B. oligostachya 

 and B. racemose, were much smutted, and in almost every 

 case hirsuta was free from smut. So it is quite evident that 

 the smut does not pass from the other two species to hirsuta. 

 This together with the great difference in the size of the 

 spores seems to justify the separation of this from U. fili- 

 fera as a distinct species. The germination is about the 

 same as U. filifera but though the spores of the latter 

 germinate very easily most of my cultures of U. minor have 

 failed to grow. 



II. TILLETIA. 



23. T. foetans (B. & C.) Schrot., Beitr. Biol. PfL, 1877, 

 p. 365. 



On wheat (Triticum sp.), common. A few spores of this 

 and the next germinated in water after about a week. Coni- 

 dia produced fasciculate on the end of the promycelium. 



24. T. Tritici (Bjerk.) Wint., Die Pilze. 



On wheat ( Triticum sp. ) Rooks and Greeley counties. 



* Since the above was first written Schroter has described a South 

 American Ustilago (U. Hieronymi) on Bouteloua ciliata, which is possibly 

 the same. 



