ON JUNCACEyE 



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 C. bavaricum. 



35. Uromyces Junci Tul. 



JEcidium 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. 



sEcidiospores. iEcidia 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 /ut. 



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 — 22 /a, with two equatorial 

 germ-pores. 



Teleido 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 fi), attenuated below, smooth, dark- 

 brown, 24 — 42 x 12 — 18 fj,; pedicels thick, persistent, brownish, 

 as much as 60 p, long. 



iEcidia on Pidicaria dyse?iterica, May — July ; uredo- and 

 teleutospores on Juncus obtusiflorus, from July onwards, lasting 

 through the winter on the dead culms. Not common. (Fig. 75.) 



Fig. 75. U. Junci. Teleuto- 

 spores, on J. obtusiflorus. 



