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MILDEWS, RUSTS AND SMUTS 
Teleutospores. Scattered, immersed in the substance 
of the leaf, at first closed, then opening by a small perfora¬ 
tion, finally broadly open and cup-shaped, edge whitish ; 
spores angularly globose, minutely warted, orange, 20—30 
[JL diam. 
Syn. Uredo sempervivi, Alb. and Schw. 
On living leaves of houseleek— Sempervivum tectorum, and 
allied cultivated species. 
During the first year of infection, the leaves are not much 
altered in appearance, but the mycelium is perennial, and 
during succeeding years the infected leaves become much 
longer than normal ones, and stand more or less erect. 
Endophyllum euphorbiae-silvaticae, Lev. 
Pyncidia. Mostly on the upper surface of the leaves, 
honey-colour. 
Teleutospores. Sori immersed in the substance of the 
leaf, mostly on the under surface, circular, edge of peridium 
thick, erect ; spores subglobose, minutely warted, orange, 
16—26 X 12—18 p. 
Syn. Endophyllum euphorhiae, Plowr., Ured., p. 228. 
Aecidium euphorhiae, Pers. 
On Euphorbia amygdaloides. 
The plants are altered in appearance, the leaves being 
stunted and covered with the fungus. Such infected 
plants rarely bloom. 
Plowright states that he did not succeed in infecting 
old plants, not even on the youngest leaves, but that seed¬ 
lings were readily infected, the mycelium passing into the 
stem, and showing the disease in after years. The mycelium 
is perennial in the host-plant. 
MILESIA, White 
Teleutospores only known. Spores i-celled, enclosed in 
a peridium which is sunk in the substance of the matrix, 
the i-celled spores eventually escaping through a small 
aperture at the apex of the peridium. 
The one known species, parasitic on ferns, is unfortunately 
rare, but very little is known respecting its life-history. 
Milesia polypodii, White. 
Teleutospores. Sori yellow, scattered or encroaching on 
each other, enclosed in a peridium which is sunk in the 
matrix, broadly obovate or pear-shaped, warted, the warts 
most numerous at the broad end of the spore, 40—50 x 
25—33 
