264 British Uvredinee and Ustilaginee. 
BIOLOGY.—This species varies very much in frequency in different 
seasons, sometimes being very abundant; at other times scarcely a 
specimen can be found. 
Afcidium periclymeni. Schum. 
Pseudoperidia on roundish, pallid, yellow spots on the leaves, 
hypogenous, cylindrical, with white, irregularly torn edges. 
Spores subglobose or polygonal, finely verrucose, yellow, 
15-27 X 15—25m. 
Synonym. 
Acidium periclymenit, Schum., “Enum. Plant. Sell.,” vol. it. 
p. 225. Cooke, ‘“Hdbk.,” p. 539; “Micro. Fungi,” 4th edit., 
p. 196. Winter, doc. cé¢., p. 264. 
Exsiccati, 
Cooke, i. 102; ii, 96; “L. F.,” 54. Vize, “Fungi Brit.,” 78. 
On Lonicera periclymenum. 
BIoLoGy.—I have made a great number of experimental cultures 
with this species during the past five years, but hitherto entirely with- 
out success. 
AGcidium prunelle. Winter. 
Pseudoperidia on yellowish brown or violet-edged spots, generally 
arranged concentrically, cup-shaped, white, with whitish, 
rather torn and everted edges. Spores colourless, polygonal, 
finely echinulate, 16-21 in diameter. 
Synonym. 
Ecidium prunelle. Winter in Rabh. (sub. Uromyces), “ Krypt. 
Flor.,” vol. i. p. 164. 
On Prunella vulgaris. 
Forres ; Rev. Dr. Keith. 
Afcidium convallarie. Schum. 
Pseudoperidia on pale or yellowish spots, which are roundish on 
the leaves and elongate on the stems, flat, with torn white 
edges. Spores subglobose, finely verrucose, yellow, 15-30 
X 14-22p. 
