. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON JUNCACEjE 123 is to remove carefully and bum 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 ColcMcum growing near, during the third season it spread to G. awlumnale and C. havancum. 35. Uromyces Junci Tul. u^ddium zonale Duby, Bot. Gall. ii. 906. Cooke, Grevillea, xiv. 39. Uromyces Junci Tul. Ann. Sci. Nat. ser. 4
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. ON JUNCACEjE 123 is to remove carefully and bum 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 ColcMcum growing near, during the third season it spread to G. awlumnale and C. havancum. 35. Uromyces Junci Tul. u^ddium 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. JEcidiospores. ^cidia 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 /i. Uredospores. Sori scattered, roundish or oblong, up to 1 mm. long, surrounded by the cleft epi- dermis, pulverulent, brown; spores globose to ellipsoid, faintly echinu- late, yellowish-brown, 20—28 x 16- germ-pores. Teleutospores. 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 /x), attenuated below, smooth, dark- brown, 24—42 X 12-;—18 fl; pedicels thick, persistent, brownish, as much as 60 fj, long. iEcidia on Pulioaria dysenterica, May—July; uredo- and teleutospores on Juncus obtusiflorus, from July onwards, lasting through the winter on the dead culms. Not common. (Fig. 75.). Pig. 75. U. Junci. Teleuto- spores, on J. ohtusiflorus. -22 jj,, with two equatorial. Please note that these images are ext
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