. The British rust fungi (Uredinales), their biology and classification. Uredineae. THECOPSORA 309 Uredo 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. Pucciniastrum Padi Dietel in Eng. u. Prantl, Natlirl. Pflanz. i. 1**, p. 47. Fischer, Ured. Schweiz, p. 463, f. 303 ; Centralbl. f. Bakter. 2. xv. 227. Thecopsora areolata Magn. in Hedwigia, 1875, p. 123. Sacc. Syll. vii. 764. Whitish, pustuhir, flat, open, exhaling a covering on the upper. Sper mo
. The British rust fungi (Uredinales), their biology and classification. Uredineae. THECOPSORA 309 Uredo 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. Pucciniastrum Padi Dietel in Eng. u. Prantl, Natlirl. Pflanz. i. 1**, p. 47. Fischer, Ured. Schweiz, p. 463, f. 303 ; Centralbl. f. Bakter. 2. xv. 227. Thecopsora areolata Magn. in Hedwigia, 1875, p. 123. Sacc. Syll. vii. 764. Whitish, pustuhir, flat, open, exhaling a covering on the upper. Sper mog ones. 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/u.; epispore very thick (up to 6 fx), 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 yu.; epispore about H/i 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/i, 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. iEcidia on cones of Picea excelsa, Scotland, Yorkshire, August, November; uredo- and teleutospores on Frunus Padus,. August, September. Very rare. (Fig. 276.) G. u. ' 24 Fig. 276. Th. Padi. a, leaf of P. Padiis, showing uredo- sori; b, scale of cone of Picea , showing fecidia (both reduce
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