292 PHRAGMIDIUM 
black; spores cylindrical or subclavate, of 3—6 cells (occasionally 
one or two), rounded or bluntly papillate at the apex, hardly 
constricted, smooth, brown, 42—80 x 20—28 w%; two or three 
germ-pores to each cell; pedicels thick, hyaline, persistent, as 
long as or much longer than the spores (100—150 y). 
On Potentilla argentea, P. verna, and various cultivated 
species. April—September. Not common. (Fig. 220.) 
This species is more closely allied to P. Sanguisorbae than to 
P. Fragariastri. The finely echinulate uredospores and the papillate 
teleutospores distinguish it from the latter. 
DistTRiBUTION: Europe, Asia Minor, Siberia, Japan, North 
America, Australia (?). 
3. Phragmidium Sanguisorbe Schrit. 
Puceinia Sanguisorbae DC. Flor. fr. vi. 54. 
Lecythea Poterti Lév. ; Cooke, Micr. Fung. p. 221, pl. 3, f. 31. 
Phragmidium Sanguisorbae Schroét. Flor. Schles. p. 352. Plowr. Ured. 
p. 221. Fischer, Ured. Schweiz, p. 408, f. 285. Sace. Syll. vii. 
742. Sydow, Monogr. iii. 156. i 
P. acuminatum Fr. ; Cooke, Handb. p. 490; Micr. Fung. p. 201, pl. 3, 
f. 30, 32, 
Spermogones. Amphigenous, flat, clustered. 
Aicidiospores. Czomata amphigenous, oblong, circinate 
round the spermogones, or irregular 
and swollen on the nerves and petioles ; 
spores verruculose, orange-yellow, 18— 
214; paraphyses curved. 
Uredospores. Sori small, scarcely 
¢mm., soon naked, surrounded by a 
circle of clavate, curved paraphyses ; 
spores globose to ovate, echinulate, 
orange-yellow, 18—24 p. 
Teleutospores. Sori punctiform, +— 
1mm., soon naked, black ; spores eylin- 
drical-oblong, of 2—5 (mostly four) cells, 
apex drawn out into a papillate beak, 
Fig.221, Ph. Sanguisorbae. faintly constricted, base rounded, some- 
a, teleutospore x 360 ; b, 
teleutospore x 600, what verruculose, yellowish-brown, 56— 
