82 
MILDEWS, RUSTS AND SMUTS 
clusters on the stem, dusky brown ; spores subglobose or 
ovate, tip rounded and thickened, smooth, chestnut-brown 
22—38 X 14—22 [X, pedicel long, stout, tinged yellowish 
or brown, persistent. 
Syn. Puccinia vaginalium, Link. 
Aecidium aviculare, Kze. 
Trichohasis polygonorum, Berk. 
Uromyces polygonorum, D.C. 
On Polygonum aviculare, also on other species of Poly¬ 
gonum in other countries. Europe generalty, Greece, 
Egypt, Madeira, Asia Minor, Persia, Japan, N. America, 
S. Africa, and Australia. 
This species is also parasitic on Rum ex acetosella on the 
Continent, and may be found on that host in this country. 
It often distorts the stem of the host-plant. 
Uromyces rumicis, Wint., Plowr., Ured., p. 135. 
Uredospores. Sori on both sides of the leaf, scattered 
spots of various sizes, minute, circular, soon naked and pow¬ 
dery, cinnamon ; spores subglobose or elliptical, echinulate, 
pale brown, 20—28 x 18—30 p, 2 -—3 germ-pores. 
Teleutospores. Similar to those of the uredo form, but 
darker in colour ; spores subglobose, ovate, elliptical 
or pear-shaped, brown, with a pale round papilla or wart 
at the tip, smooth or almost so, 24^—35 X15—25 p, pedicel 
slender, colourless, deciduous. 
83/0. Uredo rumicis, Schum. 
Uredo bifrons, D.C. 
On Rumex conglomeratus, R. obtusifolius, R. crispus, 
R. hydrolapathum, R. acetosa, R. maritimus. Europe 
generally ; Algeria, United States, Chili, S. Africa. 
LILIACEAE 
Uromyces gageae, G. Beck. 
Teleutospores. Sori occurring on both sides of the leaves, 
no distinct spots, scattered, circular or elliptical, covered 
with the grey epidermis, which splits lengthwise, becoming 
naked and powdery, dusky brown ; spores subglobose, 
elliptical or pear-shaped, tip not thickened, but with a 
pale wart, smooth, brown, 25^—^40 X 17—28 p, epispore 
rather thick, pedicel long, slender, deciduous. 
Syn. Uromyces ornithogali, Plowr., Ured., p. 142. 
On Gagea lutea. Europe generally. 
This species was confounded with Uromyces ornithogali,T oy. 
an allied species, not yet recorded as occurring in Britain 
