. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 361. Fig. 269. M. Caryo- phyllacearum. Peri- dermium elatinum, on A. pectinata (slightly reduced) ; «, a leaf, x 10. Melampsora Cerastii Wint. Pilze, p. 242 (1881). Plowr. Ured. p. 217. Melampsorella Cerastii Schrot. Flor. Schles. p. 366 (1887). Sacc. Syll vii. 596. M. elatina Arthur, N. Amer. Fl. vii. 111. Spenuogones. Epiphyllous, scattered, conical, honey-coloured. fficidiospores. iEcidia hypophyllous, arranged in an irregu- lar row on each side of the mid-rib, erumpent, short
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 361. Fig. 269. M. Caryo- phyllacearum. Peri- dermium elatinum, on A. pectinata (slightly reduced) ; «, a leaf, x 10. Melampsora Cerastii Wint. Pilze, p. 242 (1881). Plowr. Ured. p. 217. Melampsorella Cerastii Schrot. Flor. Schles. p. 366 (1887). Sacc. Syll vii. 596. M. elatina Arthur, N. Amer. Fl. vii. 111. Spenuogones. Epiphyllous, scattered, conical, honey-coloured. fficidiospores. iEcidia hypophyllous, arranged in an irregu- lar row on each side of the mid-rib, erumpent, shortly cylindrical, roundish or compressed, pale orange-red, with torn white margin; spores ellipsoid or polygonal, orange, 16— 30x14—17,0.; epispore thin, densely verru- cosa. Uredospores. Sori generally hypophyl- lous, usually arising beneath a stoma, sur- rounded by a peridium which slowly opens by an apical pore, small, crowded, pustular, yellow; spores sometimes in short chains, ovoid-oblong or ellipsoid, yellowish, 20—30 x 16—21 fi; epispore thin, beset with a small number of pointed warts which are only visible when dry, with an occasional glabrous strip (?), without perceptible germ-pores. Teleutospores. Hypophyllous, often covering the whole leaf, developed within the epidermal cells, whitish-yellow or pinkish, in little groups in each cell, roundish or flattened, one-celled, 14—21 fi; epispore smooth, thin ; basidiospores globose, nearly colourless, 7—9 fi. yEcidia on leaves of Abies pectinata, June—September; uredo- and teleutospores on Cerastium arvense, C. triviale and its var. alpestre, C. viscosum, Stellaria graminea, S. media (more rarely); uredospores from May onwards. Not very common. (Figs. 269, 270.) In North America it occurs on other species of Abies, and on Alsine and other species of Cerastium ; also in Europe on numerous allied species of the subfamily Alsinea). The teleutospores are developed on those leaves of the second bost which live thr
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