Parasitic Fungi of Illinois. 215 
July 25, 2508, IT., Aug. 28, 5642, Oct. 6, 1809, IIL, Oet. 18, 
1884, III.; Piatt, Aug. 10, 1003, IL.; Champaign, Aug. 41, 
1019, IT., Oct. 31, 6376; Lee, Sept. 9, 5751, IL; LaSalle, Sept. 
13, 1508, IIL, Berk: 17, 1586, IL; JoDavinss, Sept. 15, 5909, 
IL, H1.; Henry, Sept. 28; 1722, IT., III.; Fulton, Oct. 1, 1784, 
IIe Jackson, Nov. 5, 2261, II. 
COLEOSPORIUM, Liv. 
Teleutosori divided by horizontal septa (about three) so 
as to form unbranched vertical rows of closely connected cells, 
each of which emits, on germination, a promycelium bearing a 
single sporidium, compacted in a dense flat or convex some- 
what waxy stratum; uredospores produced in chains, which 
soon break up into a powdery mass; sorus naked. 
The species of this genus are difficult to determine mor- 
phologically one from another, and comparatively little has 
been done towards elucidating life histories through cultures. 
It is supposed that Coleosporiuim senecionis and Peridermiun 
pini are alternate forms of one species, but other acidial states 
are unknown. The so-called uredospores are produced in 
chains, and according to the classification adopted here would, 
by themselves, fall in the genus Ceoma. The query arises as 
to whether this should be looked upon as the ecidium or uredo 
stage. So far as observed this form grows on the same leaf, 
and usually just before the teleutoform, characteristics of the 
latter rather than the former. If, indeed, Peridermium pint is 
the ecidium form of Coleosporium senecionis, then the pulver- 
ulent spores on Senecio, one would say, must be the uredo 
form, and these are very similar to the first-formed spores of 
the other species. 
C. sonchi-arvensis, (Pers.) Lév. 
IIL., III. Hypogenous, rarely epiphyllous. Uredosori scat- 
tered or united in groups, often very numerous and sometimes 
crowded or confluent, elliptical or irregular, powdery; uredo- 
spores elliptical, often irregular, thickly studded with little 
obtuse tubercles, orange-yellow, but soon fading, 15-21 by 
16 
