124 



I-ROMY* ES 



The coiiiR'ction of the two tonus, lii si proA ed bj Fuckel and Plowright, 

 lias been confirmed by Fischer. < >n the continent and elsewhere, there 

 are forms of Uromyces on other species of Juncus, some of which (and 

 possibly mosl of them have their aecidia on other hosts than /'. dysenterica. 



Distribution: Central and Western Europe, Algeria, North 



and South America. 



36. Uromyces Scirpi Burr. 



jEcidium Glaucis D. et M. ; Cooke, Grevillea, xv. 29. Plowr. I 'red. 



p. 268 ; Gard. ( 'hron. ser. 3, vii. 682, 7 16. 

 Uredo Scirpi Cast. Catal. PI. Marseille, p. 214. 

 Uromyces Scirpi Burr. Parasit. Fung. Illinois, p. L68. Sacc. Syll. vii. 



558. Sydow, Monogr. ii. 302. 

 U. lineolatus Desni. ; Plowr. Grevillea, xxi. 111. 

 U. maritimae Plowr. Gard. Chron. ser. 3, vii. 682, 746 ; Jour. Roy. 



Hort. Soc. (1890), p. cix. Klehahn, Wirtswechs. Rostpilze, p. 328. 

 Nigredo Scirpi Arthur, X. Amer. Fl. vii. 233. 



Spermogones. Usually epiphyllous. 



JEcidiospores. ^Ecidia hypophyllous or on the petioles, in 

 rather small clusters, cup-shaped, with an incised re volute 

 margin ; spores densely and minutely verruculose, transparent- 

 yellowish, 16—24 x 14— 20/u. 



Uredospores. Sori hypophyllous, scattered or arranged in 

 lines, rounded or oblong, up to 1 mm. long, 

 surrounded by the cleft epidermis, pulverulent, 

 cinnamon ; spores globose to ovate, distantly 

 and minutely echinulate, yellowish -brown, 

 22 — 35 x 16 — 25 /x ; epispore 1^ — 2 /x thick, 

 with three equatorial germ-pores. 



Teleutospores. Sori amphigenous, on in- 

 definite discoloured spots, scattered or confluent 

 in lines, long covered by the epidermis, brownish- 

 black; spores oblong to clavate, tapering usually 

 and thickened (up to 12 /*) above, attenuated 

 below, smooth, pale-brown, 26 — 45 x 15 — 24 fx ; 

 pedicels brownish, persistent, as long as or longer than the 

 spore. 



Fig. 76. I '.Scirpi 

 Teleutospores, 

 on S. duviatilis. 

 Illinois, U.S.Ai 



