Parasitic Fungi of Illinois. 239 
4&. convallariz, Schum. 
Hypophyllous. Spots distinct, or more or less confluent, 
lemon-yellow, scarcely thickened; xcidia loosely clustered, ir- 
regular or subcircinate, short-cylindrical, recurved border nar- 
row and abruptly turned; spores subglobose or oval, sometimes 
angular, epispore thick, conspicuously tuberculate, 21-24 by 
24-30 »; spermagonia numerous, scattered over the central 
area of the spot on both surfaces, dark reddish brown. 
On Smilacina: McLean, May 26, 4797. S. stellata: Mc- 
Lean, June 1, 4885; LaSalle, June 19, 5224. S. racemosa: 
McLean, May 31, 4861, 4862. 
RG@STELIA, REBENT. 
Spoues one-celled, in chains or vertical rows, without pedi- 
cels; sorus enclosed in an elongated, usually tapering, pseudo- 
peridium, which pretrudes far through the ruptured epidermis 
of the host, and which becomes deeply split and fringed; with 
spermagonia. On species of Pomec. 
ZEcidia usually hypophyllous, lower part sunk in the swollen tissues 
of the leaves, forming above cylindrical, conical, or oblong projections, 
which are often split and fringed in the upper part, peridium composed 
of large colorless cells, spores brownish or orange-colored, subglobose 
when mature, formed in moniliform rows. Spermagonia punctiform, 
forming minute dark-colored pustules in discolored spots on the upper 
surface of the leaves. Mycelium infesting the leaves and stems of differ- 
ent Pomex.—Farlow, Gymnosporangia of the U.S. p. 24. 
The forms included here are now supposed to be (like those 
of A’cidium) mere stages of development of other teleutospor- 
ous species, and perhaps all belong to Gymnosporangium. The 
genetic connection of the forms placed in these two genera was 
first shown by Oersted, of Denmark, in 1865, who satified him- 
self, by artificially sowing the spores, of the relationship exist- 
ing. His conclusions have since been confirmed by DeBary in 
Germany, Cornu in France, and Cramer in Switzerland; but 
nothing conclusive has been ascertained in our country save 
from the effects in nature of the proximity of the different hosts 
and their parasites. Professor Farlow’s artificial cultures (The 
Gymnosporangia of the United States, p. 32, etc.) gave not only 
