118 UROMYCES 
The connection of the ecidium with the later stages seems not yet to 
have been experimentally demonstrated : but McAlpine found the ecidia 
on young plants of P. aviculare along with the other spore-forms. In 
Europe, ete. it is recorded on many other species of Polygonum. 
This species is said to occur also on Rumesx Acetosella on the continent, 
and should be looked for here on that host. If so, there would be three 
species on R, Acetosella to be considered : U. Polygoni which has verrucu- 
lose uredospores and smooth teleutospores ; U. Acetosae which is distin- 
guished by having teleutospores beset with a few minute warts arranged in 
lines ; while Puceinda Acetosae has aculeolate uredospores and teleutospores 
with many delicate warts. 
DISTRIBUTION: World-wide. 
30. Uromyces Lilii Fckl. 
Caeoma Lili Link, Sp. PL, ii. 8. 
Uromyces Lilti Fckl, Symb. Myc. Nachtr. iii. 16. Sydow, Monogr. ii, 
277. Fischer, Ured. Schweiz, p. 6, f. 5. Grove, Journ. Bot. 1911, 
p. 368. 
U. Brythronii DC. ; Sacc. Syll. vii. 564 p.p. Wild Fauna and Flora 
of Kew, p. 163 (non U. Erythronti Pass. %). 
Nigredo Litit Arthur, N. Amer. Fl. vii. 242. 
Spermogones. Dispersed among the ecidia, brownish- 
yellow. 
Aicidiospores. Aicidia amphigenous, usually hypophyllous, 
or even on the petioles and stems, seated on lanceolate 
yellowish spots, in rounded or elongated groups of very different 
sizes, and often extending widely, more or less crowded, for 
a long time hemispherical and closed, at length opening by a 
central pore, but scarcely cup-shaped, margin not revolute, 
about 4mm. diam. yellow; spores densely and minutely 
verruculose, yellowish, 22-35 x 18-26 w; epispore 3 thick 
or less. ; 
Teleutospores. Sori amphigenous, usually hypophyllous, on 
large yellowish spots, scattered or collected in groups, rounded 
or oblong, elongated on the petioles, at first covered by the 
epidermis, which at length splits, large, pulverulent, dark- 
brown; spores globose to oblong or pyriform, rounded above, 
with a prominent hyaline papilla, covered when mature with 
short ridges which are often disposed in lines more or less 
