MILDEWS, RUSTS AND SMUTS 
i6i 
GERANIUM 
Puccinia geranii-silvatici, Karst. 
Teleutospores. Sori on the under surface of the leaves 
and on the petioles, in clusters ; spores elliptical, ends 
rounded, tip not thickened, upper cell warted, lower 
almost smooth, brown, 22—38 X 14—22 p. 
On Geranium silvaticum. Switzerland, Austria, Norway 
and Sweden. 
Puccinia morthieri, Koern. 
Teleutospores. Sori on the under surface of the leaves, 
in large round groups on red or yellow spots ; spores oblong 
or oblong club-shaped, tip much thickened, base generally 
narrowed, constricted, smooth, brown, 40-—65 x 18—24 p, 
pedicel persistent, up to 80 p long. 
On Geranium pratense and G. silvaticum. Europe gener- 
ally. 
PRUNUS 
Puccinia cerasi. Cast. 
Uredospores. Sori minute, scattered or in groups on the 
under surface of the leaf ; spores minutely warted, yellowish 
17—30 X 15—20 p, no paraphyses. 
Teleutospores. Spores oblong, tip not thickened, usually 
rounded, slightly constricted, smooth, pale, 30—^45 X 
15—20 p. 
On Amygdalus persica, Prunus avium, P. domestica, and 
P. spinosa. Germany, Austria, France, and Italy. 
ARABIS 
Puccinia holboelli, Rostr. 
Teleutospores. Sori mostly on the under surface of the 
leaf, generally scattered over the entire surface ; spores 
oblong or somewhat club-shaped, tip rounded, thickened, 
slightly constricted, base narrowed, smooth, brown, 32—■ 
56 X 15—24 p, pedicel persistent, up to 100 p long. 
On Arabis alpina, A. hirsuta, and A. petraea. Switzer¬ 
land, Norway, Greenland, and California. 
RANUNCULUS 
Puccinia blyttiana, Lagh. 
Teleutospores. Sori mostly on the under surface of the 
leaf, scattered or in groups ; spores variable, mostly oblong, 
tip paler, scarcely/ constricted, with large, scattered warts, 
brown, 30—^44 X 17—27 p. 
On leaves and petioles of Ranunculus auricomus. Norway 
and Switzerland. 
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