. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 22S PUCCINI A [JScidia on Geranium protease, G. silvaticum\\ uredo- and teleutospores on Polygonum amphibium, I', lapathifolium, July- October; nut uiieumnion. Klobnhn and Bubak report the secidium oe G. /nolle, G. phaeum and other species. (Fig. L75.) Teleutospores are found not only in the separate sori described above, but also in the ld uredo-sori. These latter spores arc rounded at the apex ; those which grow in distinct sori often have the thickening cap forced to one side, presumably by
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 22S PUCCINI A [JScidia on Geranium protease, G. silvaticum\\ uredo- and teleutospores on Polygonum amphibium, I', lapathifolium, July- October; nut uiieumnion. Klobnhn and Bubak report the secidium oe G. /nolle, G. phaeum and other species. (Fig. L75.) Teleutospores are found not only in the separate sori described above, but also in the ld uredo-sori. These latter spores arc rounded at the apex ; those which grow in distinct sori often have the thickening cap forced to one side, presumably by the pressure of the persistent epidermis. For the distinctions of the tecidiuin of this Puccinia from that of Uromyces Gt r'imi which grows upon the same hosts, see under that species (p. 104). The proof of the connection of the secidium with the Puccinia was first given byTranzschel in Russia, and has since been confirmed by Bubak. I have not seen any British specimens of JScidium sanguinolentum ; the description given above is taken from Lindroth. Similarly in Switzerland, Fischer records only the uredo- and teleutospores. On Polygonum amphibium they seem to be confined to the terrestrial form : I have never seen them on the floating leaves. Distribution : World-wide. 98. Puccinia Polygoni-Convolvuli DC. Puccinia Polygoni-amphibii Pers. ; Sydow, Monogr. i. 569 P. Polygoni-Convolvuli DC. Flor. fr. vi. 61. P. Polygoni Plowr. Ured. p. 188 Sacc. SylL vii. 63G Fischer, Ured. Schweiz, p. 303, f. 221. Spermogones and jEcidia. Presumably similar to those of the preceding species. Uredospores. Sori hypophyllous, roundish, soon naked, brown; spores ellipsoid to obovate, echinulate, clear yellowish-brown, 24— 30 x 15—20 /x, with two opposite germ-pores. Teleutospores. Sori hypophyllous, scattered, roundish, compact, pulvinate, about \ mm. diani., soon naked and pulverulent, black; spores oblong to clavate. rounded or occasionally conical above and thickened (up to 8/a
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