Parasitic Fungi of Illinois. 171 
are substantially identical, except that in the former the teleu- 
tospore consists of a single cell, and in the latter of two cells, 
formed by a horizontal septum usually placed somewhat below 
the middle. The ecidium and uredo forms of the two genera 
are not distinguishable. That the two genera are very 
closely allied is also shown by the fact that in some species of 
Uromyces two-celled spores are met with, while, especially when 
not fully nourished, single-celled spores are quite common in 
certain Puccinie. Occasionally more than two cells are ob- 
served in true Puccinia spores, but in this case there is less dif- 
ficulty in determining the classification, because the spores in 
genera characterized by two or more transverse septa (Phrag- 
midium, etc.) are considerably different in appearance. 
In exact strictness each cell in all these divided forms 
should be called a spore, for each is independent of the others 
in germination. Some have even called the whole body a spore 
sack (ascus), and the single cells spores; but there is no dis- 
tinct wall for the former. 
The genus has been divided as follows:— 
1. Leptopuccinia.— Only teleutospores produced, which 
are firmly attached to their stems and germinate soon after 
maturity; sori quite firm, mostly hemispherical. 
2. Micropuccinia.—Only teleutospores known, these read- 
ily separating from the pedicels, germinating only after a long 
period of rest. 
3.  Hemipuccinia. — Uredo- and teleutospores known, 
zcidia not known. 
4, Pueciniopsis—Acidia and teleutospores known, uredo 
wanting. 
5. Eupuccinia.—Acidia, uredo- and teleutospores known. 
a. Autopuccinia.—All sporeforms on the same plant. 
b. Heteropuccinia.—Aicidia (and spermagonia) on a 
different host species from the uredo- and teleuto- 
spores. 
The third division now undoubtedly contains many species 
which further information will transfer to the fifth, and the 
same may be said, with less probability, of the fourth. Since 
this classification is not applied in what follows, we simply cite 
as examples of the first: P. anemones-virginiane, Schw.; P. 
