104 
MILDEWS, RUSTS AND SMUTS 
Teleutospores. Sori similar to those of the uredospores, 
blackish-brown ; spores elliptical, tip rounded, not thick¬ 
ened, not constricted at the septum, base generally rounded, 
very minutely warted, brown, 25—^40 X 15—25 p, pedicel 
very short. 
Syn. Uredo prenafithis, Schum. 
Aecidium prenanthis, Pers. 
Puccinia chondrillae, Fuckel. 
On living leaves of Lactuca muralis. Britain and Europe 
generally. 
The uredospores have three, rarely four, very distinct 
germ-pores. 
LAMPSANA 
Puccinia lampsanae, Fuckel. 
Pycnidia. On crowded circular or elongated patches. 
Aecidia. Flattened, white, edge reflexed, torn ; spores 
subglobose, almost smooth, orange, 16— 21. X 13—17 p, 
on rather large purplish spots. 
Uredospores. Sori very numerous, circular, sometimes 
encroaching on each other, powdery, chestnut-brown, 
spores subglobose or ovate, minutely echinulate, pale 
brown, 17-—22 X 15—18 p. 
Teleutospores. Sori minute, scattered, numerous, pow¬ 
dery, blackish ; spores elliptical or ovate, ends rounded, 
tip not thickened, very slightly constricted at the septum, 
very minutely punctate, chestnut-brown, 22—33 X 17— 
26 p, pedicel slender, short, often oblique. 
On Lampsana communis and Crepis paludosa. Britain, 
Europe generally, Syria, and Japan. 
ARCTIUM (=Lappa) 
Puccinia bardanae, Corda. 
Uredospores. Sori large, flat, surrounded by the torn 
epidermis, powdery, cinnamon, scattered or clustered on 
spots on the upper surface of the leaf ; secondary sori 
small, scattered or clustered, not on spots, on both surfaces 
of the leaf ; spores subglobose or ellipsoid, echinulate, pale 
brown, 25—30 x 22—27 p. 
Teleutospores. Sori on both surfaces of the leaf, most 
abundant on the under surface, minute, scattered or clus¬ 
tered, not on spots, powdery, blackish ; spores elliptical, 
fends rounded, tip not thickened, usually slightly constricted 
at the septum, very minutely warted, dusky brown, 30— 
42 X 22—27 p, pedicel short. 
