290 PHRAGMIDIUM 
character, as well as the rigid middle lamina and the position 
of the germ-pores, distinguishes the genus from all the neigh- 
bouring ones. 
l. Phragmidium Fragariastri Schrot. 
Puccinia Fragariastri DC. Flor. fr. vi. 55. 
Phragmidium obtusum Link, Sp. Pl. ii. 84 p.p. Cooke, Handb. 
p. 491; Micr. Fung. p. 201 (as obtusatum). 
P. Fragariastri Schrét. Flor. Schles. iii. 351. Plowr. Ured. p. 220. 
Fischer, Ured. Schweiz, p. 412, f. 287.. Sacc. Syll. vii. 742. 
Sydow, Monogr. iii. 101, f. 45. 
Spermogones. In little clusters, honey-coloured. 
4icidiospores. Cxomata mostly hypophyllous or on the 
veins and petioles, irregular, 
scattered, often confluent and 
large, bri ght-orange, surrounded 
by clavate paraphyses; spores 
densely verruculose, orange- 
yellow, 17—28 x 14—21 ps. 
Uredospores. Sori hypo- 
phyllous, scattered, roundish, 
soon naked, surrounded by and 
mixed with hyaline, thin-walled 
Fig. 219. Ph. Fragariastri. Uredo- ee itate palep hy BES “BpOIeS 
spore, paraphysis, and teleutospore ; roundish, densely verruculose, 
ae teleutospore boiled in lactic orange-y ellow, 18—24 be 
Teleutospores. Sori hypo- 
phyllous, scattered, minute, roundish, pulverulent, brown; spores 
cylindrical or rarely somewhat clavate, of 2—5 (mostly four) 
cells, rounded, at both ends, sometimes slightly thickened and 
paler at the summit but never papillate, faintly constricted, 
rather pale-brown, 45—70 x 2228 y, sometimes with a few 
delicate warts which are more abundant towards the apex, but 
generally quite smooth ; usually three germ-pores to each cell ; 
pedicels colourless, 14—21 w long. 
a 
On Potentilla Fragariastrum (=P. sterilis), and possibly 
on other species of the genus, but never on Fragaria vesca. 
March—October. Very common. (Fig. 219.) 
