. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 228 PUCCINIA [JJcidia on Geranium prateiise, G. silvaticiim-^ uredo- and teleutospores on Polygonum amphibiuni, P. lapathifoUum, July— October; not uncommon. Klebahn and BubEik report the Eecidium on G. molle, G. phaeum and other species. (Fig. 175.) Teleutospores are found not only in the separate sori described above, but also in the old uredo-sori. These latter spores are rounded at the apex ; those which grow in distinct sori often have the thickening cap forced to one side, presumably by the pressure of th
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 228 PUCCINIA [JJcidia on Geranium prateiise, G. silvaticiim-^ uredo- and teleutospores on Polygonum amphibiuni, P. lapathifoUum, July— October; not uncommon. Klebahn and BubEik report the Eecidium on G. molle, G. phaeum and other species. (Fig. 175.) Teleutospores are found not only in the separate sori described above, but also in the old uredo-sori. These latter spores are 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 secidiuna of this Puccinia from that of Uromyees Qeranii 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 by Tranzschel in Russia, and has since been confirmed by Bub4k. I have not seen any British specimens of Meidium sangidnolentum ; 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-v^ride. 98. Puccinia Polygoni-Cdnvolvuli DC. Puccinia Polygoni-amphihii Pers. ; Sydow, Monogr. i. 569 P. Polygoni-ConvolvuK DC. Flor. fr. vi. 61.' P. Polygoni Plowr. Ured. p. 188 Sacc. Syll. vii. 63G Fischer, Ured. Sohweiz, p. 303, f. 221. Spermogones and JJJcidia. 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. diam., soon naked anil pulverulent, black; spores oblong to clavate, rounded or occasionally conical above and thickened (up to 8/j.), faintly c
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