242 British Uredinee and Ustilaginee. 
Synonyms. 
Schrot., loc. cit., p. 362. 
Uredo acidioides. TD. C., “Flore frang.,” vol. ii. p. 236. 
Caoma egirinum. Schlecht. “ Flor. Berol.,” vol. il. p. 124. 
On Populus alba. 
BIoLOGy.—The ecidiospores of this species are Ca@oma mer- 
curialis. After performing many cultures with the Melampsore, I 
at last placed the germinating teleutospores of this species, obtained 
from Dinmore Hill, Herefordshire, in October, 1887, on a plant of 
M. perennis (Exp. 711); the spermogonia appeared in about ten days. 
A duplicate culture on Clematis vitaloa was without effect. 
Melampsora populina. (Jacq) 
Uredospores—Sori hypogenous, roundish, at first covered by the 
epidermis, orange. Spores elongate, elliptical, or ovate, echinu- 
late, orange-yellow, 28-40 X 15-204. Paraphyses more or 
less abundant, capitate or ovate, 45-55 X 20pm. 
Teleutospores—Sori hypophyllous, flat, generally crowded, often 
confluent, forming reddish brown, then blackish crusts. 
Spores cylindrico-prismatic, in section polygonal, pale brown, 
larger above, 40-50 X 10-15, 
Synonyms. 
Lycoperdon populina. Jacq., “ Collect.,” Sup., t. ix. figs. 2, 3. 
Uredo cylindrica, Strauss. Berk., “‘ Eng. Flor.,” vol. v. p. 385, 
in part. 
Lecythea populina, Lév. Cooke, “ Micro. Fungi,” 4th edit., 
p. 221. 
Melampsora populina, Lév. Cooke, “ Hdbk.,” p. 523 ; “ Micro. 
Fungi,” 4th edit., p. 219, t. ix. figs. 195, 196. Schrot., oc. cit., 
p- 362. 
Uredo populina, Grev., “ Flor. Edin.,” p. 442. Johnst., “ Flor. 
Berw.,” vol. ii, p. 200. Purton, “Midl. Flor.,” vol. iii t. 27, 
No. 1542. 
LEexstecatt, 
Cooke, i, 83; ii. 61, 135; “L. F.,” 47. Vize, “Fungi Brit.,” 
135, 231; ‘‘ Micro, Fungi Brit,” 326, 443. 
an 
