EUTHALLEPHYTA—EUMYCETES— SMUTS 219 



Mr. W. A. Kelty informs me that the smartweed smut ( Ustilago utriculosa) 

 often produces severe irritation of the hands when corn is husked. 



TiLLETiACEAE, Schrot 



Mycelium becoming gelatinized in the tissues; the promycelium gives rise to 

 the terminal cluster of elongated sporidia which fuse or do not fuse in pairs, 

 producing secondary sporidia which may be alike or unlike, or the sporidia 

 germinate directly into infection threads. About 150 species, of which Tilletia 

 is the most important genus; aside from the two species described below one 

 species, T. secalis is found upon rye, T. hordei upon barley,, etc., Neovossia 

 lowensis on Phragmites communis, Urocystis occulta on rye, Urocystis agropyri 

 upon quack grass, and Bntyloma ranunculi upon anemone. 



Fig. 58. Wheat Bunt {Tilletia foetens). At the left, a beardless variety with bunt 

 kernels. At the right, a bearded variety with bunt kernels. From U. S. Dept. Agrl. 



Tilletia, Tul. Bunt 



Sori in various parts of the plant, usually in the ovaries, forming a dusty 

 spore mass; spores 1-celled, formed singly in the ends of the mycelial threads, 

 promycelium of germinating spore short with a terminal cluster of elongated 

 sporidia. 53 species are reported for the genus. 



Tilkiia foetens (B. & C.) Trel. Stinking Smut or Bunt 



Sori in the ovaries, wheat glumes more or less spreading; spores light to 

 dark brown, oblong or sub-spherical, or spherical or sometimes irregular, 



