382 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
The writer is indebted to Professor Rostrup of Copenhagen for a 
specimen of the type of this smut which has been reported only 
from Greenland. The very minute oblique striae are rather pecu¬ 
liar. The germination has not been reported. 
Ustilago Piperii Clint, n. sp. 
Sori forming pustules on under side of leaves, several mm. in 
diameter though usually more or less completely confluent, often 
confined to the margin, upon rupture of thin covering membrane 
showing dusty dark purple spore mass; spores reddish purple, ovate 
or ovoid to chiefly subspherical or spherical, occasionally more 
irregular, minutely and usually obliquely striate, chiefly 7-10 p, or 
irregular ones occasionally 12 p, in length. 
Host: Polygonum Davisiae , Calif.; P. phytolaccaefolium , Ida. 
(type). 
In the character of the spores this species approaches very 
closely to Ustilago Koenigiae , the spores averaging slightly larger, 
while in the character of the sorus it is like Ustilago Bistortarum. 
Some forms of this latter species (? var. glabra Kostr.) also have 
the spores minutely striate-granular while others are even echinu- 
late, but the spores in either case are much larger than in the 
species described here. The writer is indebted to C. Y. Piper for 
the type specimens of this species. 
Ustilago Bistortarum (PC.) Korn. 
Uredo Bistortarum a pustulata DC., El. Fr., 6: 76. 1815. 
Uredo Bistortarum p marginalis DC., El. Fr., 6 : 76. 1815. 
Ur edo pteridiformis Funk, Crypt. Grev., 564. 1819. 
Caeoma Bistortarum Lk., Sp. PI., 6-: 10. 1825. 
Caeoma marginale Lk., Sp. PI., 6 2 : 10. 1825. 
Uredo marginalis Rab., Ivrypt. FI., 1 : 7. 1844. 
Tilletia bullata Fckl., Symb. Myc., 40. 1869. 
Ustilago Bistortarum Korn., Heclw., 16 : 88. Mr. 1877. 
Ustilago Bistortarum Sclirot., Colm’s Beitr. Biol. Pflanz., 2 : 356. 1877. 
Also: Ustilago Bistortarum forma pustulata , Ustilago Bistortarum 
forma marginalis, Ustilago pustulata , Ustilago marginalis , of authors. 
Exsiccati : Ustilago Bistortarum forma pustulata (DC.), on Polygo¬ 
num viviparum, Rab.-Wint., Fungi Eur., 3502. 
Sori in leaves, either in pustules 2-5 mm. in diameter scattered 
