. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON JUNCACE/K 123 is to remove carefully and burn all diseased leaves before they mature their spores. The fungus is stated to have attacked the foliage of the host for three successive seasons, completely destroying it, and although for the first two seasons it did not attack other species of Colchicum growing near, during the third season it spread to C. autumnale and G. havaricum. 35. Uromyces Junci TuL ^cidium zonale Duby, Bot. Gall. ii. 906. Cooke, Grevillea, xiv. 39. Uromyces Junci Tul. Ann. Sci. Nat. ser.
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON JUNCACE/K 123 is to remove carefully and burn all diseased leaves before they mature their spores. The fungus is stated to have attacked the foliage of the host for three successive seasons, completely destroying it, and although for the first two seasons it did not attack other species of Colchicum growing near, during the third season it spread to C. autumnale and G. havaricum. 35. Uromyces Junci TuL ^cidium zonale Duby, Bot. Gall. ii. 906. Cooke, Grevillea, xiv. 39. Uromyces Junci Tul. Ann. Sci. Nat. ser. 4, ii. 146. Cooke, Grevillea, vii. 139; Micr. Fung. p. 213. Plowr. Ured. p. 132 ; Grevillea, xi. 52. Sacc. Syll. vii. 541. Sydow, Monogr. ii. 287. Fischer, Ured. Schweiz, p. 57, f. 43. Nigredo Junci Arthur, N. Amer. Fl. vii. 238. Spermogones. Usually epiphyllous. ^cidiospores. yEcidia hypophyllous, seated on spots which are zoned with yellow and purple, in dense circinate clusters 2—5 mm. wide, cup-shaped, yellowish-white, with a torn revolute margin; spores densely and minutely verruculose, transparent-yellowish, 17—21 [x. U7-edospores. Sori scattered, roundish or oblong, up to 1 mm. long, surrounded by the cleft epi- 1 • 1 1 J. I, Fig- 75. U. Junci. Teleuto- dermis, pulverulent, brown; spores t^ores, on J. obtusijiorus. globose to ellipsoid, faintly echinu- late, yellowish-brown, 20—28 x 16—22 fi, with two equatorial germ-pores. Teleuto spores. Sori amphigenous or on the culms, scattered or occasionally aggregated, similar to the uredo-sori, but darker; spores oblong-ovate to clavate, rounded or conical above and much thickened (up to 14 /a), attenuated below, smooth, dark- brown, 24—42 X 12—18 (x ; pedicels thick, persistent, brownish, as much as 60 /x long. ^cidia on Pulicaria dysenterica, May—July; uredo- and teleutospores on Juncus obtusijlorus, from July onwards, lasting through the winter on the dead culms. Not common. (Fig. 75.). Please note that these
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