Parasitic Fungi of Minois. 205 
brown, teleutospores usually three, sometimes two, more often 
four-celled, oblong or broadly clavate, somewhat constricted at 
the septum, vertex slightly thickened, obtusely rounded, nar- 
rowed toward the base, epispore thin, smooth, 21-27 by 36-90 p; 
pedicel hyaline, tapering below, from one third to one half 
the length of the spore. 
On leaves of Potentilla Canadensis: Union, April 16, 5015, 
IL, April 26, 4311, IL, April 29, 4390, II.; Jackson, April 19, 
4177, IL, April 28, 4866, IL; Pulaski, May 9, 4579, IL; John- 
son, May 12, 4651, II.; LaSalle, June 15, 4909, IL, Sept. 28, 
6223. TIL, Sept. 20, 6232, ITL; Adams, June 27, 5807, IL, July 
3, 0384, IL., July 5, 5407, IL, 5417, IL, July 6, 5444, IL., July 
10, 5461, IT.; MeLean, July 26, 2415, IL; McHenry, Aug. 25, 
1321, IL., III.; Stephenson, Sept. 18, 5816, IT.; JoDaviess, Sept. 
15, 5896, III.; Ogle, Sept. 26, 6188, IT., III.; Fulton, Oct. 3, 
1731, IL, TIL; Jersey, Oct. 12, 6274, III. 
This is Ph. triarticulatum, B. & C.; but there is little rea- 
son to consider the American specimens specifically distinct 
from the European Ph. fragariwv, according to Winter's de- 
seription (Die Pilze, p. 228), and the specimens in Rabh. Herb. 
Mye., 281. On neither the latter nor the Illinois specimens 
was there observed any roughness of the epispore. 
Ph. mucronatum, ( Pers.) Lk. 
I, IL, TL. Aicidia amphigenous, on the leaves more com- 
monly hypophyllous, and of different sizes, but usually small, 
in little groups on a distinct reddish, yellow-bordered spot, on 
the larger veins, petioles, and young stems confluent and swol- 
len, conspicuous, causing more or less distortion of the host, 
surrounded by clavate, incurved, colorless paraphyses, bright 
orange-colored; ecidiospores subglobose or angular, produced 
in erect chains, becoming rough-warty towards maturity, 18-24. 
#; uredosori hypophyllous, small, scattered, very numerous, 
sometimes sparingly confluent, surrounded by many incurved, 
clavate, colorless paraphyses, yellow; uredospores subglobose, 
rough-warty, each produced on a pedicel, 18 »; teleutosori hy- 
pophyllous, scattered, small, powdery, brownish-black; teleuto- 
spores cylindrical or oblong-elliptical, vertex narrowed. and mu- 
cronate, apiculus hyaline, six- to eleven-septate, rather coarsely 
