. The British rust fungi (Uredinales), their biology and classification. Uredineae. 358 MELAMPSORIDIUM MELAMPSORIDIUM Klebahn. Heteroecious. Teleutospores one-celled, with brownish membrane, united into fiat waxy crusts, but each little group starts almost always directly beneath a stoma. Uredo-sori surrounded by a hemi- spherical peridium which opens by an apical pore, often begin- ning beneath a stoma; uredospores abstricted singly, more or less smooth at one end, with indistinct germ-pores, not mixed with capitate paraphyses. ^cidia with a well-developed inflated peridium. Spermogones subcu
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 358 MELAMPSORIDIUM MELAMPSORIDIUM Klebahn. Heteroecious. Teleutospores one-celled, with brownish membrane, united into fiat waxy crusts, but each little group starts almost always directly beneath a stoma. Uredo-sori surrounded by a hemi- spherical peridium which opens by an apical pore, often begin- ning beneath a stoma; uredospores abstricted singly, more or less smooth at one end, with indistinct germ-pores, not mixed with capitate paraphyses. ^cidia with a well-developed inflated peridium. Spermogones subcuticular, other sori subepidermal. This genus is, in some respects, as closely allied to Puccini- astrum as to Melampsora, or rather more to the former than to the latter. Melampsoridium betulinum Kleb. Uredo populina var. betulina Pers. Syn. p. 219. Melampsora hetulina Desm. ; Cooke, Handb. p. 522, f. 212 (misnamed winter spores); Micr. Fung. p. 219, pi. 9, f. 189, 190. Plowr. Ured. p. 243. Sacc. Syll. vii. 592. Melampsoridmm hetulinum Kleb. Zeitschr. f. Pflanzenkr. 1899, p. 21^ (see also 1891, p. 130); Wirtswecbs. Eostp. p. 401. Fischer, Ured. Schweiz, p. 512, f. 320. jEcidiospores. ^cidia hypc^yllous, single or in longitu-. Fig. 267. M. hetulinum. a, peridium of uredo-sorus, viewed from above, showing the point at which it will dehisce, x ; h, uredospores, x 600. dinal rows parallel to the mid-rib, small, oval or oblong, 1—1^ mm. long, clear reddish-orange, with irregularly torn margin;. 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, William Bywater. Cambridge, Univ. Press
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