178 Illinois State Laboratory of Natural History. 
The uredoform is Uromyces prunorum, Fckl. The shape 
and attachment of the cells of the teleutospores vary. on differ- 
ent hosts. On Prunus Americana the cells are nearly or quite 
globular, and easily separated, while on, P. serotina they are 
well joined and variable. 
Nees (Syst. d. Pilze u. Schwiimme [1816]), under the 
generic name of Dicwoma, separated the Puccinia species in 
which the spores spontaneously-divided at the septum before 
germination. P. pruni-spinose belongs to this group. 
P, Peckiana, Howe. 
Ill. Hypogenous. Sori small, scattered, few or many, 
sometimes sparingly confluent, cinnamon-brown, powdery; 
spores in one view more or less triangular, in the other, at right 
angles to the first, elliptical, not constricted at segment, upper 
segment triangular, with a small hyaline, obtusely rounded 
apiculus, lower segment in side view somewhat quadrate, with 
two basal projections, to one of which the pedicel is attached, 
and the other is terminated with a hyaline apiculus similar to 
that of the upper segment, 22-27 (base) by 36-45 u; pedicel 
hyaline, fragile. 
On Rubus villosus: Urbana, July 24, 1884, T. J. Burrill. 
This may be the teleutoform of what is called Ceoma 
nitens, Schw., the ‘orange rust” of the blackberry, so well 
known to horticulturists. The Puccinia has also been found 
on raspberry leaves in New York, and the Ceoma sometimes 
occurs on the latter host. Puccinia tripustulata, Peck, is 
the same species, and so admitted by the author of the latter 
name. 
P. tiarelle, B. & C. 
III. Amphigenous. Spots small, distinct, reddish brown; 
sori scattered, circular, prominent, on the petioles more or less 
elongated and sometimes confluent, chestnut-brown; spores 
elliptical, constricted at the septum, vertex much thickened, 
and usually prominently pointed, base mostly obtusely rounded, 
epispore rather thin, smooth, 12-18 hy 21-36 »; pedicel nearly 
hyaline, very slender, once to twice as long as the spore. 
On Mitella diphylla: Kane, Aug. 30, 1382. 
