124 UROMYCES 
The connection of the two forms, first proved by Fuckel and Plowright, 
has been confirmed by Fischer. On the continent and elsewhere, there 
are forms of Uromyces on other species of Juncus, some of which (and 
possibly most of them) have their ecidia on other hosts than P. dysenterica, 
DiIsTRIBUTION: Central and Western Europe, Algeria, North 
and South America. 
36. Uromyces Scirpi Burr. 
Aeidium Glaucis D. et M.; Cooke, Grevillea, xv. 29, Plowr. Ured. 
p. 268 ; Gard. Chron, ser. 3, vii. 682, 746. 
Oredo Scirpi Cast. Catal. Pl. Marseille, p. 214, 
Uromyces Scirpi Burr. Parasit. Fung. Ilinois, p. 168. Sacc. Syll. vii. 
558. Sydow, Monogr. ii. 302. 
U. lineolatus Desm.; Plowr. Grevillea, xxi. 111. 
U. maritimae Plowr. Gard. Chron. ser. 3, vii. 682, 746; Jour. Roy. 
Hort. Soc. (1890), p. cix. Klebahn, Wirtswechs. Rostpilze, p. 328. 
Nigredo Scirpi Arthur, N. Amer. Fl. vii. 233. 
Spermogones. Usually epiphyllous. 
Aicidiospores. Aicidia hypophyllous or on the petioles, in 
rather small clusters, cup-shaped, with an incised revolute 
margin; spores densely and minutely vérruculose, transparent- 
yellowish, 16—24 x 1420 wu. 
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 p; epispore 14—2 pw thick, 
with three equatorial germ-pores. 
Teleutospores. Sori amphigenous, on in- 
definite discoloured spots, scattered or confluent 
Fig.76. U.Scirpi. 1n lines, long.covered by the epidermis, brownish- 
ne black; spores oblong to clavate, tapering usually 
Illinois, U.S.A. and thickened (up to 12) above, attenuated 
below, smooth, pale-brown, 26—45 x 15—24 w; 
pedicels brownish, persistent, as long as or longer than the 
spore. 
