MILDEWS, RUSTS AND SMUTS 
105 
Syn. Uredo hardanae, Straus. 
Puccinia lappae, Cast. 
On various species of hmdock—Arctium. Britain and 
Europe generally. 
The^ uredqspores have three, rarely four, germ-pores. 
LEONTODON 
Puccinia leontodonis, Jacky. 
Uredospores. Sori scattered, minute, cinnamon, on both 
sides of the leaf ; spores subglobose or elliptical, echinulate, 
pale brown, 35 x 24—27 p. 
Teleutospores. Sori'similar to those of the uredospores, 
blackish ; spores variable, generally elliptical, ovate- 
elliptical or oblong, tip rounded, not thickened, not at all, 
or very slightly constricted at the septum, very minutely 
warted, 30—40 x 21—27 p, epispore.t.kiT,'.p^^c^l short. 
Syn. Uredo apargiae, Schleich. 
On living leaves of various species of Leontodon. Britain 
and Europe generally. ‘ ■' ' ~ ' 
PRENANTHES 
Puccinia prenanthis-purpurae, Lindr. ! 1 
Aecidia. In groups on more or less, circular yellow or 
purplish-yellow, large spots, or on elongated spots following 
the veins, hemispherical then broadly open, yellow or whitish 
sometimes yellowish-purple ; spores subglobose or -ellip¬ 
soid, very minutely warted, pale orange, 15—24 x 12—20 p. 
Uredospores. Sori scattered, very minute, on small 
yellowish spots on the under surface of the leaf, powdery, 
pale brown ; spores subglobose, minutely echinulate, yel¬ 
lowish, 17— 25 p diam. ■ •' 
Teleutospores. Sori similar to those of the'uredospores, 
brown ; spores elliptical or ovate, tip rounded, not thick¬ 
ened, scarcely constricted at the Septum, base generally 
rounded, very minutely warted, brown, 24—37 X 16—^24 p, 
epispore thin, pedicel short. 
Syn. Aecidium prenanthis, Schm. . c, 
Piiccinia prenanthis, Plowr., Ured., p. 148 (in part). 
Confined to Prenanthis purpurea, an alien or escape 
from cultivation in this country. Britain and Europe gener- 
ally. 
The uredospore has three, rarely four germ-pores. This 
is practically a biological species, as there is little or'no 
morphological distinction between the present and P. 
