100 
MILDEWS, RUSTS AND SMUTS 
On living leaves and stem of chicory— Cichoria intyhus. 
Britain, Europe generally. 
The uredospores have two germ-pores. 
CIRSIUM 
Puccinia obtegens, Tul. 
Pycnidia. Crowded over the entire under surface of the 
leaf, emitting a pleasant odour resembling honey. Sori 
of uredospores and teleutospores of the first generation 
minute, crowded and often encroaching on each other, 
minute, powdery, brown then dusky, occupying the entire 
under surface of the leaf. 
Uredospores. Second generation ; sori hypophyllous, 
minute scattered ; spores globose, subglobose or broadly 
elliptical, echinulate, pale brown, 21—28 p diam. 
Teleutospores. Second generation ; sori hypophyllous, 
minute, scattered, blackish.'brown, elliptical or ovate- 
elliptical, rounded at both ends, or slightly narrowed at the 
base, tip not thickened, little or not at all constricted at the 
septum, very minutely warted, brown, epispore thin, 
26—^42 X 17—25 p ; pedicel short, slender, colourless. 
Syn. Caeoma ohtegens, Link. 
' Caeoma seoavlens, Link. 
Uredo suaveolens, Pers. 
Puccinia ohtegens, Fuckel. 
Puccinia suaveolens, Rostr. ; Plowr., p. 182. 
Trichohasis suaveolens, Lev. 
Parasitic on leaves and stem of Cnicus arvensis, Hoffm. 
[=Carduus arvensis), (=Cirsium arvensis). Europe, N. 
America. 
The mycelium is perennial in the rootstock, and gives 
origin, each season, to the pycnidia, and the uredospores 
and teleutospores of the first generation. The second 
generation of uredospores and teleutospores^—there are no 
pycnidia—are the result of infection by the uredospores of 
the first generation. The mycelium of this generation is 
localised. 
The pleasant odour, remarked from early times by 
mycologists, when the leaves of an infected plant are rubbed, 
is produced by the contents of the pycnidia (spermogonia). 
The uredospores have three germ-pores.' 
Diseased plants appear earlier in the season than healthy 
ones, and are readily recognised by the sickly pale yellowish- 
green colour of the leaves, which stand very erect, no 
flowers are produced by infected plants. 
