. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 1 hi DTROMYCES of contamination by foreign spores was not entirely excluded in his experiments. Judgmenl on this point must be suspended DISTRIBUTION: Europe, Algeria, Asia Minor, Africa, Cali- fornia, Chili. 28. Uromyces Acetosae Schrot. Uredo bifrons I>l'. ; Cooke, Eandb. p. 528 ; Micr. Fung. p. 217, pi. vii. Bgs. 137—9. Uromyces Rwmicis Wint.; Plowr. Ured. p. 135 Fischer, Ured. Schweiz, p. 9 (not f. 8) ('. Acetosae Schrot. in Rab. Fung. Europ. no. 2080 (1876). Sacc. Syll. vii. &
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 1 hi DTROMYCES of contamination by foreign spores was not entirely excluded in his experiments. Judgmenl on this point must be suspended DISTRIBUTION: Europe, Algeria, Asia Minor, Africa, Cali- fornia, Chili. 28. Uromyces Acetosae Schrot. Uredo bifrons I>l'. ; Cooke, Eandb. p. 528 ; Micr. Fung. p. 217, pi. vii. Bgs. 137—9. Uromyces Rwmicis Wint.; Plowr. Ured. p. 135 Fischer, Ured. Schweiz, p. 9 (not f. 8) ('. Acetosae Schrot. in Rab. Fung. Europ. no. 2080 (1876). Sacc. Syll. vii. ">37. Sydow, Monogr. ii. 241. [Spermogones. Honey-coloured, clustered. J-'.riiliospores. iEcidia amphigenous or on the petioles, in dense clusters (up to 1 cm. broad), cup- shaped, whitish-yellow, with a cut and re volute margin; spores nearly smooth or very minutely punctate, clear-yellowish, 18—21 x 12—18 Fig. 68. U. Acetosae. r J Teleutospores, on Uredospores. Sori amphigenous, often seated on red or purple spots, scattered or circinate, minute, pulverulent, cinnamon; spores subglobose to ellipsoid, finely and densely verruculose, yellowish or pale brownish-yellow, 18—25 x 17-—22 /x ; epispore about 2|/i, thick, with three germ-pores. Teleutospores. Sori similar, but dark-brown; spores sub- globose to ellipsoid, not thickened above, or rarely with a paler and very minute papilla, rounded below, beset with very minute warts arranged in lines, brown, 21—26x20—24 /j,; epispore rather thick; pedicels thin, hyaline, deciduous. On leaves and petioles of Rumex Acetosa, R. Acetosella. May—September. Not uncommon. (Fig. 68.) Allied to U. Rwmicis, but U. Acetosae has shorter spores (of both kinds) and the hyaline papilla of the teleutospores is almost always wanting. The secidium has not been found in Britain, but the other stages are rather common : the uredo- and teleutospores are unusually alike, but can be distinguished by the germ-pores and the fewer wa
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