218 Illinois State Laboratory of Natural History. 
Schweinitz, and as such distributed by Ravenel in his Fungi 
Caroliniani IV. No. 99, and Fungi Americani, No. 488. In 
both of those specimens the Coleosporium form is found. Our 
specimens on Ipomea Nil have the spore-chains somewhat more 
slender, and the color of those examined is not quite so deep as 
that of those on J. pandurata. 
CHRYSOMYXA, UNGER. 
Teleutospores composed of several cylindrical cells in sim- 
ple or branched vertical rows, the lower cells sterile, each of 
the upper producing a several-celled promycelium bearing about 
four sporidia, sorus naked, compact, flat or convex, red or 
orange-yellow; uredospores in vertical rows, soon pulverulent, 
sorus naked. . 
It is understood that Peridermium abietinum, (Alb.& Schw.) 
is genetically related to one or more species of this genus as 
the zcidium-stage. 
Not so far observed in Illinois. 
UREDO, Liv. 
Spores one-celled, produced singly on pedicels from which 
they readily separate at maturity, forming a powdery mass; 
sorus without pseudoperidium, without spermagonia. 
Many, perhaps all, are forms of plants belonging to other 
genera classified by the teleutospores, as Uromyces, Puccinia, 
etc., and constitute what is known as the second stage of the 
Uredinee; but some of the so-called species have not yet been 
connected even in supposition with any teleutosporic forms. 
The spores germinate at maturity, and soon lose their vitality; 
the germ tube produces the mycelium directly, without the in- 
, tervention of sporidia. The sorus is in some cases surrounded 
by paraphyses, usually club-shaped and incurved, a character- 
tic of the so-called genus Lecythea. 
For the comparison between Uredo and Con, see the 
latter. 
