Parasitic Fungi of Illinois. 219 
U. hydranges, B. & C. 
Hypogenous. Spots small, yellowish, more or less conflu- 
ent. Sori minute, scattered, few; spores obovate, produced on 
pedicels, minutely tuberculate, 12-18 by 16-24 x. 
On Hydrangea arborescens. 
This name is attached to specimens in the Curtis herbarium, 
and published in Curtis’ Cat. Plts. N. C., p. 122, without des- 
cription. The specimens from which the desorption | is taken 
were collected by Mr. F. 8. Earle, Cobden, Oct. 13, 1879. 
There is no evidence of the occurrence of the fungus else- 
where in the State. 
COMA, Tut. 
Spores one-celled, produced in vertical chains, soon sepa- 
rating in a powdery mass, sorus without pseudoperidium, but 
sometimes covered by a thin adherent membrane, often with 
spermagonia, and with or without paraphyses. 
The term Czeoma has been used with several and very dif- 
ferent significations. As here limited it does duty, probably 
temporary, as a genus of so-called species of which teleuto- 
sporic forms are still unknown. As defined the genus differs 
from Uredo in the manner of the production of the spores, and 
from Avcidiim in the absence of a peridium. According to 
some authors the presence of spermagonia is taken as the special 
characteristic of Cwonw as against Uredo, so that with these 
writers the forms having spores in chains, but without sperma- 
gonia, are arranged under the latter, as, for example, the so- 
called Uredo agrimoniv,—herein found as Cwoma agrimonia, 
Schw. It, however, seems pretty evident that, with or without 
spermagonia, those forms having spores in chains represent 
rather the zcidial than the uredo stage, and as some species of 
Afcidium have no spermagonia, the absence of the latter in 
Ceoma ought not to be unlooked for. 
Some of the so-called Cwome have been identified as the 
ecidial forms of Phragmidium, which see. Compare also Cole- 
osporiumn. 
