MILDEWS, RUSTS AND SMUTS 
99 
or ellipsoid, echinulate, brown, 20—31 x 16—28 fx, gener¬ 
ally on the under surface of the leaf. 
Teleutospores. Sori minute, often crowded into each 
other, powdery, blackish, on both surfaces of the leaf ; 
spores elliptical or pear-shaped, rounded at both ends, 
tip not thickened, scarcely constricted at the septum, very 
minutely warted, 25—50 x 18—30 p, pedicel usually 
very short. 
On Centaurea nigra. Britain, Europe generally, Siberia, 
Asia Minor and United States. 
The sori of the primary uredospores are scanty, and often 
surrounded by the pycnidia. 
CHRYSANTHEMUM 
Puccinia chrysanthemi, Roze. 
Uredospores. Sori scattered or clustered on pale spots, 
sometimes arranged in circles and spots not evident, pow¬ 
dery, cinnamon ; spores subglobose or elliptical, echinulate, 
brown, 24—^32 x 14—17 p. 
Teleuto spores. Mixed with uredospores and following 
on, elliptical or elliptic-oblong, tip rounded and slightly 
thickened, scarcely constricted at the septum, minutely 
warted, chestnut-brown, 35—43 X 20—25 p, pedicel 
stout, long. 
Mesospores. Subglobose or pear-shaped, tip rounded 
and slightly thickened, very minutely warted, chestnut 
colour. 
On living leaves of cultivated species of Chrysanthemum. 
Some few years ago this fungus assumed an epidermic 
form, and for a time threatened to render the cultivation 
of the Chrysanthemum impossible. 
CICHORIUM 
Puccinia cichoria, Bell. 
Uredospores. Sori minute, scattered or in groups, on 
both surfaces of the leaf and on the stem, powdery, cinna¬ 
mon ; spores subglobose or elliptical, echinulate, yellowish 
brown, 21—27 p diam. 
Teleuto spores. Sori like those of uredospore, on both 
surfaces of the leaf and on the stem, blackish brown ; spores 
elliptical, tip rounded, not thickened, scarcely consticted 
at the septum, base generally rounded, smooth, brown, 
27—38 X 19—25 p, epispore thin, pedicel short. 
