. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 348 MELAMPSOEA Teleutospores. Sori hypophyllous, subepidermal, scattered over the leaf singly and in groups, pulvinate, \—f mm., blackish-brown, not shining; spores prismatic, rounded at both ends, 35—60 x 6—10 /i; epispore clear-brown, 1—1^ fi thick, scarcely thickened above, without evident germ-pore. Cseomata on Allium Cepa, A. ursinum and other species. May; uredo- and teleutospores on Populus nigra, P. balsami- fera. (Fig. 260.) The description is chiefly after Klebahn. The teleutospores mature in February
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 348 MELAMPSOEA Teleutospores. Sori hypophyllous, subepidermal, scattered over the leaf singly and in groups, pulvinate, \—f mm., blackish-brown, not shining; spores prismatic, rounded at both ends, 35—60 x 6—10 /i; epispore clear-brown, 1—1^ fi thick, scarcely thickened above, without evident germ-pore. Cseomata on Allium Cepa, A. ursinum and other species. May; uredo- and teleutospores on Populus nigra, P. balsami- fera. (Fig. 260.) The description is chiefly after Klebahn. The teleutospores mature in February of the following year; I find them shorter than given above, viz. 25—32 fi, and somewhat truncate at the summit. The CEeoma of species of Melampsora on Alliwm is easily distinguished from the secidium of Puccinia Winteriana on the same host by the absence of a peridium. (2) Melampsora Larici-populina Kleb. Gaeoma Laricis Plowr. Ured. p. 262 Melampsora populina L^v. ; Plowr. Ured. p. 242 (see note, "Biology," p. 243). M. Larici-populina Kleb. in Zeitschr. f. Pflanzenkr. 1902, xii. 43. Fischer, Ured. Schweiz, p. 502, f. 316. JEcidiospores. Cfeomata on hardly perceptible spots, scarcely 1 mm. long, bright yellowish-orange; spores oval or roundish, 17—22x14—18/*; epispore 1|—2/* thick, colourless, finely Fig. 261. M. Larici-populina. «, teleutospores; 6, uredospores and paraphysis. On P. ontariensis. Uredospores. Sori mostly hypophyllous, in little groups, causing yellowish angular spots on the upper side, rarely. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Grove, W. B. (William Bywater), 1848-1938. Cambridge, University Press
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