. The British rust fungi (Uredinales), their biology and classification. Uredineae. 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. Cooke, Haiidb. 8permogones. jEcidiospnres. Phragmidium Fragariastri Schrot. Pticcinia Fragariastri DC. Flor. fr. vi. .55. Phragmidium ohtusum Link, Sp. PI. ii. 84 p. 491 ; Micr. Fung. p. 201 (as obtusatum). P. Fragariastri Schrot. Flor. Schles. iii. 351. Plowr. Ured. p. 220. Fischer, Ured. Schweiz, p. 412, f. 287. Sacc. Syll. vii. 742. Sydow, Monogr. ii
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 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. Cooke, Haiidb. 8permogones. jEcidiospnres. Phragmidium Fragariastri Schrot. Pticcinia Fragariastri DC. Flor. fr. vi. .55. Phragmidium ohtusum Link, Sp. PI. ii. 84 p. 491 ; Micr. Fung. p. 201 (as obtusatum). P. Fragariastri Schrot. 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. In little clusters, honey-coloured. Casomata mostly hypophyllous or on the veins and petioles, irregular, scattered, often coniiuent and large, bright-orange, surrounded by clavate paraphyses; spores densely verruculose, orange- yellow, 17—28 X 14—21 ^l. Uredospores. Sori hypo- phyllous, scattered, roundish, soon naked, surrounded by and mixed with hyaline, thin-walled capitate paraphyses; spores roundish, densely verruculose, orange-yellow, 18—24 jjl. Teleiitospores. Sori hypo- jjhyllous, 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 22—28 /x,, sometimes with a few delicate warts which are more abundant towards the apex, but generally quite smooth ; usually three germ-pores to each cell; j)edicels colourless, 14—21 //, long. On Potentilla Fragariastrum (= P. sterilis), and possibly on other species of the genus, but never on Fragaria vesca. March—October. Very common. (Fig. 219.). Fig. 219. Ph. Fragariastri. Ureclo- spore, parajjhysis, and teleutospore ; a, a teleutospore boiled in lactic Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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