Ustilagineo'. 277 



Ustilago bistortarum. (D. C.) 



Produced in buUate masses in the leaves, at first hemispherical, 

 then bursting, black. Teleutospores subglobose, dark violet, 

 obscurely punctate, 10-20 x \2-\^^. 



Synofiyms. 



Schrot., loc. cit., p. 271. Winter, loc. cif., p. 95. 



Uredo bistortarum, var. D. C, "Flore fran^.," vol. vi, p. 76, 



Tilktia bidlata, Fckl. Cooke, " Micro Fungi," 4th edit., 



p. 233- 



On Polygonum bistorta and Ruinex sj>. (?) 

 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 5/* in diameter, the 

 elongate 5-15 X 4-5M- 



Synonyms. 



Winter, loc. cit., p. 91. Schrot., loc. cit., p. 269. 



Uredo olivacea. D. 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. 



Exsiccati. 

 Cooke, i. 298; ii, 435. Vize, " Fungi Brit.," 32. 



On Carex riparia. 

 June and July. 



Biology.— The function and origin of the filaments are unknown. 

 See p. 84. 



