. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON POLYGONACE^ 117 On the same host-plants is a Puccinia, which (in the absence of the teleutospores) can be distinguished only by the fact that the uredospores have two (rarely three) germ-pores and are adorned with few and distant spines. There is little doubt that many of the specimens recorded as U. Acetosae are really the uredospores of Puccinia Acetosae. Distribution : Germany, France, Sweden, Nonvay, Finland. 29. Uromyces Polygoni Fckl. JEcidium aviculariae Kze.; Cooke, Handb. p. 545; Micr. Fung. p. 199.
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON POLYGONACE^ 117 On the same host-plants is a Puccinia, which (in the absence of the teleutospores) can be distinguished only by the fact that the uredospores have two (rarely three) germ-pores and are adorned with few and distant spines. There is little doubt that many of the specimens recorded as U. Acetosae are really the uredospores of Puccinia Acetosae. Distribution : Germany, France, Sweden, Nonvay, Finland. 29. Uromyces Polygoni Fckl. JEcidium aviculariae Kze.; Cooke, Handb. p. 545; Micr. Fung. p. 199. Puccinia vaginalium Link; Cooke, Handb. p. 495 ; Micr. Fung. p. 204. Trichobasis Polygonorum Berk.; Cooke, Micr. Fung. p. 226 Uromyces Polygoni Fckl. Symb. Myc. p. 64. Cooke, Handb. p. 519 ; Micr. Fung. p. 213. Plowr. Ured. p. 123. Sacc. Syll. vii. 533. Sydow, Monogr. ii. 236. Fischer, Ured. Schweiz, p. 61, f. 46. McAlpine, Rusts of Australia, p. 99, f. 150—1. SjJernwgones. Honey-coloured, conical, only a few together. JEcidiospores. Mostly hypophyllous, on yellow or violet spots, irregularly aggregated or in circular groups, cup-shaped, whitish, with a cleft and revolute margin; spores verruculose, yellowish, 15—21 x 14—18/x. Uredospores. Sori amphigenous or on the stems, scattered or in small clusters, small, round, soon naked, pulverulent, cinnamon; spores glo- bose to ellipsoid, densely and minutely verruculose, pale-brown, 18—26 x 17—24yu-; epispore 1|—2^ /i thick, with three or four germ-pores. Teleutospores. Sori like the uredo- sori, but larger and more confluent upon pj^ gg^ jj Poiygoni. the stems, compact, dark-brown: spores Teleutospores, on P. '- 1111 aviculare. globose or obovate, rounded above and thickened (up to 6 /la), smooth, chestnut-brown, 22—38 x 14— 22 fji; pedicels coloured, persistent, thick, as much as 90 fj, long. On Polygonum avicidar-e. x'Ecidia, rare. May—June, Man- chester (T. Brittain), 1875; uredo- and teleutospores, very
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