Parasitic Fungi of MMinois. 241 
PERIDERMIUM, Linx. 
Spores one-celled, in chains or vertical rows, without pedi- 
cels; sorus inclosed in a variously-shaped pseudoperidium, which 
protrudes through the ruptured substratum and bursts irregu- 
larly; with spermagonia. On Conifere. 
This so-called genus is composed of probable ecidioforms 
of Melampsora, Chrysomyxa and Coleosporium species. The 
mycelium is, however, perennial in the bark and medullary 
rays of coniferous trees, from which the fruit-form may be an- 
nually produced during seventy or more years,—the parts of 
the host in the meantime becoming variously deformed, and the 
growth more or less seriously reduced. 
Not yet observed in Illinois. 
ENDOPHYLLUM, LivEILLE. 
Spores one-celled, produced in -chains or vertical rows, 
without pedicels, the sorus inclosed in a pseudoperidium im- 
mersed in the substratum; with spermagonia. 
This genus was at first separated from Acidiwm only on 
account of the immersed pseudoperidia, which, unlike those of 
the latter genus, do not protrude through the ruptured epider- 
mis to form a separate cup-like organ; but later investigations 
have shown that the spores in germination emit a true promy- 
celium bearing sporidia, altogether similar to the germination- 
development of the teleutospores of Puccinia and the other 
genera of Uredinew. The mycelium in the newly affected plant 
survives the winter and fruits the next spring. 
No species yet observed in Illinois. They may be looked 
for on various species of Crassulacew, and perhaps on those of 
Euphorbiacee. 
