MILDEWS, RUSTS AND SMUTS 157 
The aecidia are produced on living leaves of Rumex 
acetosa. 
The uredospores and teleutospores on the leaves of 
Phragmites communis. 
Britain, Germany, and Holland. 
The uredospores and teleutospores are practically in¬ 
distinguishable from those of Puccinia phragmitis, Koern., 
but the aecidial form is produced on Rumex acetosa, and 
not on any other species of Rumex, nor on Ranunculus. 
Puccinia poarum, Neils. ; Plowr., Ured., p. 168. 
Pycnidia. On the upper surface of the leaves. 
Aecidia. On the under surface of the leaves, on more or 
less circular, yellowish or brownish spots, cylindrical then 
expanding, edge recurved, toothed, white ; spores poly¬ 
gonal, minutely warted, orange, 18—25 x 16—20 p. 
Uredospores. Sori on the leaves, also frequently on the 
culm, minute, circular or elliptical, yellow ; spores globose, 
subglobose or elliptical, minutely echinulate, yellow, 17— 
28 X 17—25 p, with numerous capitate paraphyses inter¬ 
mixed. 
Teleutospores. Sori on the leaves and also frequently 
on the culm, scattered or here and there in clusters, minute, 
more or less circular, oblong or narrow, covered by the 
epidermis, blackish ; spores ovate-oblong on oblong club- 
shaped, variable in form, tip rounded, truncate or narrowed, 
slightly thickened and deeply coloured, very slightly or not 
at all constricted at the septum, base more or less narrowed, 
smooth, brown, 30—^45 X 16^—22 p, pedicel short,‘ tinged 
brown. 
Syn. Aecidium tussilaginis, Gmel. 
Aecidium compositarum. Mart. 
The aecidia occur on living leaves of Coltsfoot— Tussilago 
farfar a. 
Uredospores and teleutospores on Poa annua, P. alpina, 
P. compressa, P. trivialis, P. pratensis, P. nemoralis. 
Britain, Europe, Japan, and N. America. 
TRITICUM 
Puccinia agropyri, Ellis and Everh. 
Aecidia. On the under surface of the leaves, on the leaf¬ 
stalks, and on the stem, spots generally yellowish-brown, 
with a darker bolder, spots rarely absent, shortly cylin¬ 
drical, edge broadly, recurved, torn ; spores subglobose or 
angular, minutely warted, i8-—27 p diam. 
