. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 290 PHEAGMIDIUM character, as well as the rigid middle lamina and the position of the germ-pores, distinguishes the genus from all the neigh- bouring ones. 1. Phragmidium Frag^ariastri Schrot. Puccinia Fragariastri DC. Flor. fr. vi. 55. Phragmidium, ohtusum Link, Sp. PL ii. 84 Cooke, Handb. p. 491 ; Micr. Fung. p. 201 (as ohtusatum). P. Fragariastri Schrot. Flor. Schles. iii. 351. Plowr. Ured. p. 220. Fischer, Ured. Sohweiz, p. 412, f. 287. • Sacc. Syll. vii. 742. Sydow, Monogr. iii. 101, f. 45. Spermogone
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 290 PHEAGMIDIUM character, as well as the rigid middle lamina and the position of the germ-pores, distinguishes the genus from all the neigh- bouring ones. 1. Phragmidium Frag^ariastri Schrot. Puccinia Fragariastri DC. Flor. fr. vi. 55. Phragmidium, ohtusum Link, Sp. PL ii. 84 Cooke, Handb. p. 491 ; Micr. Fung. p. 201 (as ohtusatum). P. Fragariastri Schrot. Flor. Schles. iii. 351. Plowr. Ured. p. 220. Fischer, Ured. Sohweiz, p. 412, f. 287. • Sacc. Syll. vii. 742. Sydow, Monogr. iii. 101, f. 45. Spermogones. In little clusters, honey-coloured. ^cidiospores. Cssomata mostly hypophyllous or on the veins and petioles, irregular, scattered, often confluent and large, bright-orange, surrounded by clavate paraphyses; spores densely verruculose, orange- yellow, 17—28 X 14—21 fjL. 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/x. 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 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; pedicels colourless, 14—21 (jl long. On Potentilla Fragariastrum (= P. stenlis), and possibly on other species of the genus, but never on Fragaria vesca. March—October. Very common. (Fig. 219.). Pig. 219. Ph. Fragariastri. Uredo- spore, paraphysie, and teleutospore; a, a teleutospore boiled in laotie Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a
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