MILDEWS, RUSTS AND SMUTS 
103 
HIERACIUM 
Puccinia hieracii, Mart. 
Uredospores. Sori usually scattered, minute, soon naked, 
powdery, cinnamon, on both surfaces of the leaf, but most 
numerous on the upper side ; spores echinulate, yellowish- 
brown, 24—29 X 16—25 p. 
Teleutospores. Sori similar to those of the uredospores, 
blackish-brown ; spores elliptical or ovate-elliptical, tip 
rounded, not thickened, scarcely constricted at the septum, 
base rounded, rarely narrowed, very minutely warted, brown 
25—^40 X 16^—-24 p, pedicel generally very short. 
Syn. Puccinia hieracii, Plow., Ured., p. 184 (in part). 
On Hieracium vulgatum, H. murorum, H. pilosella, and 
other species of Hieracium. Britain and Europe generally ; 
Asia, N. America. 
Confined to the genus Hieracium. 
HYPOCHOERIS 
Puccinia hypochoeridis, Oud. 
Uredospores. Sori scattered, powdery, cinnamon, on 
minute spots, on both sides of the leaf and on the stem, the 
primary sori are of medium size, the secondary sori are 
minute ; spores subglobose or ellipsoid, echinulate, pale 
brown, 22—28 p. 
Teleutospores. Sori scattered, minute, on both surfaces 
of the leaf, larger on the stem, powdery, black ; spores 
elliptical, tip rounded, not thickened, scarcely constricted 
at the septum, base rounded or rarely narrowed, very 
minutely warted, brown, 30—^46 X 18—24 p, pedicel short. 
On leaves and stem of Hypochoeris glabra, H. radicata, 
and other species of Hypochoeris. Britain, Europe gener¬ 
ally, Siberia, N. and S. America. 
LACTUCA 
Puccinia prenanthis, Lindr.; Plowr., Ured., p. 148 (in 
part). 
Aecidia. On large yellow or purplish spots, often 
elongated on the veins, hemispherical then flattened, yellow, 
whitish, or sometimes tinged purple; spores minutely 
warted, pale orange, 13—25 p diam. 
Uredospores. Sori scattered, minute, powdery, pale 
brown, on pale spots of variable size on the under surface 
of the leaf ; spores subglobose, echinulate, yellow-brown, 
15—25 p diam. 
