. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON VIOLA 201 Puccinia Vlolae DC. Flor. fr. vi. 62 (1815). Plowr. Ured. p. 152. Sydow, Mouogr. i. 439. Sacc. Syll. vii. 609. Fischer, Ured. Schweiz, p. 139, f. 106. P. Violarum Link, Sp. Plant, ii. 80 (1824). Cooke, Handb. p. 504 ; Micr. Fung. p. 210; Grevillea, iii. pi. 49, f. 5, 10 «, h. Spermogones. Crowded in little clusters, yellowish. JEcidiospores. McidvA on all the green parts of the host, on the leaves often forming swollen yellowish spots, generally in roundish, or irregularly expanded, groups, on the
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON VIOLA 201 Puccinia Vlolae DC. Flor. fr. vi. 62 (1815). Plowr. Ured. p. 152. Sydow, Mouogr. i. 439. Sacc. Syll. vii. 609. Fischer, Ured. Schweiz, p. 139, f. 106. P. Violarum Link, Sp. Plant, ii. 80 (1824). Cooke, Handb. p. 504 ; Micr. Fung. p. 210; Grevillea, iii. pi. 49, f. 5, 10 «, h. Spermogones. Crowded in little clusters, yellowish. JEcidiospores. McidvA on all the green parts of the host, on the leaves often forming swollen yellowish spots, generally in roundish, or irregularly expanded, groups, on the stem some- times scattered, flat, with a white irregularly torn revolute margin; spores delicately verruculose, orange, 16—24x10— 18 Fig. 149. P. Violae. a, leaf of V. silvatica with tecidia; h, teleutospore, seen wet; c, the same, seen dry ; d, a mesospore. Uredospores. Sori hypophyllous, scattered or circinate, minute, soon naked, pulverulent, cinnamon-brown; spores glo- bose to ellipsoid, echinulate, brownish, 20—26 x 17—23/x, with two germ-pores. Teleutospores. Sori similar, but darker; spores ellipsoid to oblong, rounded at both ends or gently attenuated below, thickened and paler above, hardly constricted, faintly punctate, chestnut-brown, 20—40x15—23/i,; pedicels hyaline, deciduous, rather long; a few mesospores are found. On all green parts of Viola canina, V. hirta, V. odorata, V. Riviniana, V. silvestris. Very common, ^cidia, April— June ; teleutospores, August—November. (Fig. 149.) The punctatiou of the teleutospores is very delicate, like little pin- pricks, and can only be seen when they are dry ; these spores are generally described as smooth and appear so except in the most favourable circumstances. The germ-pore of each of the cells is covered with a paler convex cap. The connection of all the spore-forms of this species was. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readab
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