Ustilaginee. 277 
Ustilago bistortarum. (D. C.) 
Produced in bullate masses in the leaves, at first hemispherical, 
then bursting, black. Teleutospores subglobose, dark violet, 
obscurely punctate, 10-20 X 12-15. 
Synonyms. 
Schrot., Zoe. cit, p.. 271. Winter, 4c. cit., p. 95. 
Uredo bistortarum, var. D, C., ‘Flore frang.,” vol. vi. p. 76. 
Tilletia bullata, Fckl, Cooke, “Micro Fungi,” 4th edit., 
P. 233+ 
On Polygonum bistorta and Rumex sp. (?) 
July and August. 
Ustilago olivacea. (D. C.) 
Produced in the fructification, at length pulverulent and mixed 
with filaments, dark olive-brown. ‘Teleutospores variable in 
form and size, roundish, angular, ovate, elongate, or sub- 
cylindrical and curved, pale olive-brown, smooth or finely 
punctate. The globose spores are about 5y in diameter, the 
elongate 5-15 X 4-5m 
Synonyms. 
Winter, Joc. cit., p. 91. Schrot., Zoe. ciz., p. 269. 
Uredo olivacea, VD. C., “ Flore frang.,” vol. vi. p. 78. Berk., 
“ Eng, Flor.,” vol. v. p. 376, 
Ustilago olivacea, Tul. Cooke, “Hdbk.,” p, 513; “Micro. 
Fungi,” 4th edit., p. 230, t. vi. figs. 126, 127. 
LExsiccati. 
Cooke, i. 298 ; il, 435. Vize, ‘‘ Fungi Brit.,” 32. 
On Carex riparia. 
June and July. 
BroLoGy.—The function and origin of the filaments are unknown. 
See p. 84. 
