176 
MILDEWS, RUSTS AND SMUTS 
or elliptical, minutely waited, orange-yellow, 18—28 x 
13—20 (ji, surrounded by club-shaped, curved paraphyses. 
Uredospores. Sori small, orange-yellow, surrounded by 
club-shaped paraphyses ; spores globose, ovate or broadly 
elliptical, echinulate, orange-yellow, 17—^30 X 15—25 
Teleutospores. Sori small, scattered, roundish, blackish ; 
spores variable, cylindrical, tip rounded, sometimes with a 
small wart, 3—^4-septate, brown, sometimes coarsely waited, 
more especially towards the tip, at other times almost 
smooth, with intermediate stages, 45—65 x 20—30 p., 
pedicel usually shorter than the spore. 
Syn. Phragmidium fragariastri, Schroet. ; Plowr., Ured., 
p. 220 
Phragmidium ohtusatum, Fries. 
Phragmidium poterii, Fuckel. 
Phragmidium sauguisorbae, Winter ; Plowr., Ured., 
p. 221. 
Phragmidium potentillae, Winter ; Plowr., Ured., 
p. 221. 
Phragmidium tormentillae, Fuckel ; Plowr., Ured., 
p. 222. 
On Potentilla fragariastrum, P. argentea, P. tormentilla, 
and on other cultivated species, Poterium sanguisorha. 
Europe, Persia. 
Examination of a large series of specimens proves that 
P. sanguisorbae, P. potentillae, and P. tormentillae, are 
but forms of P. fragariastri. There is every transition 
in the amount of waiting of the teleutospore, from being 
coarsely waited, more especially towards the tip, to being 
almost perfectly smooth. There is sometimes a small wart 
at the tip of the teleutospore, sometimes not. 
XENODOCHUS, Schlecht. 
Aecidia. Forming rather large patches of a clear orange 
colour ; spores in chains ; paraphyses present. 
Teleutospores. Forming blackish sori; spores very long, 
cylindrical, often bent, many-septate, pedicellate. 
Differing from Phragmidium in the greater number of 
septa present in the teleutospores, and it is doubtful as to 
whether this constitutes a sound reason for separating the 
two genera. 
Xenodochus carbonarius, Schlecht. ; Plowr., Ured., p. 
227. 
Aecidia. Forming rather large, orange-red patches, 
