. The British rust fungi (Uredinales) their biology and classification. Rust fungi. THECOPSORA 369 Vredo Padi K. et S. exsicc. 187. Cooke, Handb. p. 527. U. porphyrogenita Kze. ; Cooke, Micr. Fung. p. 216. Melampsora Padi Cooke, Handb. p. 523 (1871). Plowr. Ured. p. 246. Fung. Fl. Yorkshire, p. 184. Puociniasirum Padi Dietel in Eng. u. Prantl, Naturl. Pflanz. i. 1**, p. 47. Fischer, Ured. Sohweiz, p. 463, f. 303; Centralbl. f. Bakter. 2. xv. 227. Tkecopsora areolata Magn. in Hedwigia, 1875, p. 123. Sacc. Syll. vii. 764. Whitish, pustular, flat, open, exhaling a covering on the upper. Spermogon
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. THECOPSORA 369 Vredo Padi K. et S. exsicc. 187. Cooke, Handb. p. 527. U. porphyrogenita Kze. ; Cooke, Micr. Fung. p. 216. Melampsora Padi Cooke, Handb. p. 523 (1871). Plowr. Ured. p. 246. Fung. Fl. Yorkshire, p. 184. Puociniasirum Padi Dietel in Eng. u. Prantl, Naturl. Pflanz. i. 1**, p. 47. Fischer, Ured. Sohweiz, p. 463, f. 303; Centralbl. f. Bakter. 2. xv. 227. Tkecopsora areolata Magn. in Hedwigia, 1875, p. 123. Sacc. Syll. vii. 764. Whitish, pustular, flat, open, exhaling a covering on the upper. Spermogones. strong smell. jEcidiospores. .^cidia crowded, (sometimes the under) side the lower part of the scales of the fallen cones, hemispherical or polygonal; peridium thick, brown, woody, opening by a slit; spores oval, inequilateral, yellow, 21—28x17—20/x; epispore very thick (up to 6 /u), echinulate, with a narrow, thinner, smooth stripe. Uredospures. Sori hypophyllous, clustered on spots 1—5 mm. wide which are brownish above, reddish or purplish below, and more or less bordered by the veins, covered by the epidermis and by a peridiutn which opens at the, summit by a pore ; spores oblong-oval or irregular, echinulate, pale-yellowish, 15—21 x 10—14 yu,; epispore about 1^/A thick. Teleutospores. Developed in the epidermal cells, several in each, epiphyllous or occasionally hypophyllous, forming dark- brown shining crusts which are bounded by the veins; spores oval-cylindrical or prismatic, 22—30 x 8—14 ix, divided by thin longitudinal walls into 2—4 cells; epispore thin, slightly thickened above, clear-brown, smooth, with a germ-pore in the upper and inner corner of each cell. ^cidia on cones of Picea excelsa, Scotland, Yorkshire,, August, November; uredo- and teleutospores on Frunus PadiiSy August, September. Very rare. (Fig. 276.) G. u. 24 Fig. 276. Th. Padi. a, leaf of P. Padus, showing uredo- sori; 6, scale of cone oi Picea excelsa, showing secidia {both reduce
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