MILDEWS, RUSTS AND SMUTS 143 
lowish spots ; spores globose or ovate, finely echinulate, 
brown, 18—20 p diam. 
Teleutospores. Sori mostly on the under surface of the 
leaves, small, black, naked, persistent, linear or elongated ; 
spores smooth, dark brown, oblong or wedge-shaped, the 
upper cell usually darker, rounded and thickened at the tip, 
lower cell somewhat narrowed below, slightly constricted 
at the septum, 40—50 x 20 p, pedicel long, persistent. 
Aecidia on Centaurea nigra. 
Uredospores and teleutospores on Car ex arenaria. 
Puccinia extensicola, Plowr., Ured., p. 181. 
Aecidia. On pale spots, which are more or less circular 
on the leaves, and elongated on the stem, in rings or scat¬ 
tered, often on both surfaces, edge torn, white ; spores 
globose, very finely echinulate, orange-yellow, 20—25 p 
diam. 
Uredospores. Sori minute, elliptical or linear, 1 eddish- 
brown, on rather large pale spots ; spores subglobose or 
ovoid, rather irregular, very finely echinulate, brownish- 
yellow, 25—30 X 15—20 p. 
Teleutospores. Sori small, elongated, black, surrounded 
by the torn epidermis ; spores ovate or somewhat club- 
shaped, tip thickened, rounded or pointed, narrowed below, 
slightly constricted at the septum, smooth, brown, 40— 
60 X 18—20 p, pedicel short, persistent. 
Aecidia on Aster tripolium. 
Uredospores and teleutospores on Car ex extensa. Britain, 
Istria. 
Puccinia paludosa, Plowr., Ured., p. 174. 
Aecidia. Irregularly clustered on the leaves, leafstalks, 
stem, and sometimes on the involucre, only slightly pro¬ 
truding, edge white, torn ; spores subglobose, echinulate, 
orange, 15—28 x 10—16 p. 
Uredospores. Sori small, oval or elongated, soon naked 
and powdery, pale brown, on yellowish spots ; spores 
globose, rarely oval, brown, with small pointed warts, 
which are scattered, 20—25 p diam. 
Teleutospores. Sori small, oval or elongated, rarely 
roundish, often in long, narrow lines, naked, black ; spores, 
upper cell rounded and thickened above, often obliquely, 
lower cell subcylindrical, or wedge-shaped, rather deeply 
constricted at the septum, smooth, dark brown, 50—60 
X 18—20 p, pedicel rather long, brownish, persistent. 
