MILDEWS, RUSTS AND SMUTS 135 
spores subglobose or ovate, very minutely echinulate, 
yellowish-brown, 25—35 X 20—30 [jl. 
Telentospores. Sori on both sides of the leaf, also fre¬ 
quently on the leafstalks, circular or irregular, sori elon¬ 
gated on the leafstalks and flower stems on discoloured 
spots ; spores elliptical or oblong, tip rounded and slightly 
thickened, constricted at the septum, base generally rounded, 
very minutely warted, brown, 35 — 50 x 20—30 p, pedicel 
colourless, rather long. 
Syn. Puccinia hiichanani, De Toni. 
On Oxyria reniformis. Britain, Germany, Switzerland, 
Norway, Iceland, N. America. 
POLYGONUM 
Puccinia polygoni-amphibii, Pers. 
IJredospores. Sori irregularly scattered, or often in 
circular groups, circular, soon naked and powdery, ochra- 
ceous, then brownish, on the under surface of the leaves ; 
spores globose, elliptical or ovoid, echinulate, yellowish- 
brown, 20—30, X 15— 25 [1. 
Teleutospores. Sori on the under surface of the leaf, 
scattered or in circular clusters, sometimes scattered over 
the entire surface of the leaf, crowded, circular or elliptical, 
groups elongated on the stem, sometimes soon naked, at 
other times for some time covered by the epidermis, dusky 
brovm ; spores club-shaped or oblong, tip much thickened, 
rounded, somewhat pointed or truncate, scarcely constricted 
at the septum, base generally narrowed, smooth, chestnut- 
brown, 40—60 X 18— 30 [ji, pedicel persistent, rather thick, 
as long as the spore, colourless or tinged brown. 
S3m. Uredo polygononim, D.C. 
Puccinia amphihii, Fuckel. 
Puccinia polygoni, Pers.; Plowr., Ured., p. 188. 
Puccinia polygonorum, Link. 
Trichobasis polygonorum, Berk. 
On Polygonum amphihium, P. convolvulus, P. Lapathi- 
folium, and P. persicaria. Britain, Europe, Africa, India, 
China, Japan, N. and S. America. 
Puccinia bistortae, D.C.; Plowr., Ured., p. 192. 
Uredospores. Sori scattered or somewhat clustered, 
minute, circular, powdery, ochraceous, on the under surface 
of the leaf ; spores globose or elliptical, very minutely 
echinulate, yellow, 25—^30 x 18— 22 p. 
Tel euto spores. Sori scattered or more or less in small 
