. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 22li PUCCINIA as regards Pol. viviparum Kiebahn expresses doubts, but Semadeni was able successfully to infect that species with uredospores from Pol. Bistorta. The form mi Pol. viviparum is here kept provisionally distinct, since the secidium on Angelica has not been found in Britain. Of the second group, P. mammillata, there are two biological races— (1) P. Mei-mammillata Semadeni, on Meum, and (2) /'. Angelicae-mam- millata EOebahn, on Angelica. Neither of these has beep found in Britain. Al
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 22li PUCCINIA as regards Pol. viviparum Kiebahn expresses doubts, but Semadeni was able successfully to infect that species with uredospores from Pol. Bistorta. The form mi Pol. viviparum is here kept provisionally distinct, since the secidium on Angelica has not been found in Britain. Of the second group, P. mammillata, there are two biological races— (1) P. Mei-mammillata Semadeni, on Meum, and (2) /'. Angelicae-mam- millata EOebahn, on Angelica. Neither of these has beep found in Britain. All the four of these are closely allied ; in Sydows' Monographia it is suggested that possibly in all these cases the secidium on the Umbellifer is merely facultative and the Puccinia can maintain itself without that aid. 96. Puccinia Polygoni-vivipari Karst. Puccinia Bistortae DC. ; Cooke, Grevillea, ii. 161 ; Micr. Fung. p. 204 Plowr. Ured. p. L92. Sacc. Syll. vii. Sydow, Monogr. i. 571 P. Polygoni-vivipari Karst. Enum. Fung. Lapp. p. 2-2]. Fischer, Ured. Schweiz, p. 100, f. 76 (?). U redospores. Sori hypophyilous, scattered, small, roundish, cinnamon-brown, girt by the erect epidermis; spores roundish to ellipsoid, finely echinulate, pale-brown, 20—23 x 16—17 /a. Teleutospores. Sori similar, but blackish-brown; spores elliptical to obovate-oblong, rounded and not thickened above,. Fig. 174. P. Polygoni-vivipari. a, two teleutospores from liar Lodge; b, uredo- and teleutospore from a specimen issued by Fuckel, Symb. Myc. 57 ; both on Polygonum viviparum. hardly or not at all constricted, rounded or slightly tapering below, smooth, brown, 20—30 x 15—20/z; epispore very thin and translucent; no papilla on the germ-pores; pedicels deciduous, short. On Polygonum viviparum. Very rare. Xear Mar Lodge, August, 1822 (Dr Greville). Braemar, August, 1882 (Prof. Trail). (Fig. 174.) This species is closely allied to P. Conopodii-Bistortae (q. v.), but in the abse
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