264 British Uredinece and Ustilagijtece. 



Biology. — This species varies very much in frequency in different 

 seasons, sometimes being very abundant ; at other times scarcely a 

 specimen can be found. 



.fficidium 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 15-25/^- 



Synonym. 



JEcidium periclyme?ii. Schum., " Enum. Plant. Ssell.," vol. ii. 

 p. 225. Cooke, "Hdbk.," p. 539; "Micro. Fungi," 4th edit., 

 p. 196. Winter, loc. cif., p. 264. 



Exsiccafi. 

 Cooke, i. 102; ii. 96; " L. R," 54. Vize, "Fungi Brit," 78. 



On Lotiicera peridymenum. 



Biology. — I have made a great number of experimental cultures 

 with this species during the past five years, but hitherto entirely with- 

 out success. 



.fficidium prunellae. 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, i6-2ija in diameter. 



Syno7iyi)i. 

 yEcidiian prunellce. Winter in Rabh. (sub. Uromyces), " Krypt. 

 Flor.," vol. i. p. 164. 



On Prunella vulgaris. 

 Forres ; Rev. Dr. Keith. 



.fficidium convallariae. 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 14-22/^. 



