. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. THECOPSORA 369 Credo Padi K. et S. exsicc. 187. Cooke, Handb. p. 527. U. Kze. ; Cooke, Micr. Fung. p. 21(5. Melampsora Padi Cooke, Handb. p. 523 (1871). Plowr. Ured. p. 246. Fung. Fl. Yorkshire, p. 184. Pucciniastrum Padi Dietel in Eng. u. Prantl, NatUrl. Pflanz. i. 1**, p. 47. Fischer, Ured. Schwciz, p. 463, f. 303 ; Centralbl. f. Bakter. 2. xv. 227. Thecopsora areolata Magn. in Hedwigia, 1875, p. 123. Sacc. Syll. vii. 764. Spermogones. Whitish, pustular, flat, open, exhaling a
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. THECOPSORA 369 Credo Padi K. et S. exsicc. 187. Cooke, Handb. p. 527. U. Kze. ; Cooke, Micr. Fung. p. 21(5. Melampsora Padi Cooke, Handb. p. 523 (1871). Plowr. Ured. p. 246. Fung. Fl. Yorkshire, p. 184. Pucciniastrum Padi Dietel in Eng. u. Prantl, NatUrl. Pflanz. i. 1**, p. 47. Fischer, Ured. Schwciz, p. 463, f. 303 ; Centralbl. f. Bakter. 2. xv. 227. Thecopsora areolata Magn. in Hedwigia, 1875, p. 123. Sacc. Syll. vii. 764. Spermogones. Whitish, pustular, flat, open, exhaling a strong smell. sEcidiospores. yEcidia crowded, covering on the upper (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 /j.), 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 peridium which opens at the summit by a pore ; spores oblong-oval or irregular, echinulate, pale-yellowish, 15—21x10—14 //,; epispore about H/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 /*, 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 iEcidia on cones of Picea excelsa, Scotland, Yorkshire, August, November; uredo- and teleutospores on Prunus Padus,, August, September. Very rare. (Fig. 276.) g. u. 24. Fig. 276. Th. Padi. a, leaf of P. Padus, showing uredo- sori; b, scale of cone of Picea excelsa, showing a
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