APPENDIX. 221 



Lecythea Ruborum, Lev. Bramble Rust ; spots pale, 

 brown or purple on the opposite side, sometimes depressed 

 above; sori subrotund, aggregate; epidermis soon bursting; 

 spores globose or subglobose, echinulate, bright ochraceous- 

 yellow.— On the under surface of Bramble-leaves. July and 

 August. Very common. Uredo spores of Phraqmidium. (Plate 

 III. fig. 40.) 



Lecythea Rosse, Lev. Rose Rust ; spots yellow, small, 

 scattered ; spores sub-oval, sometimes minutely pedicellate, 

 orange.— On Rose-leave6. July, September. Extremely common. 

 Uredo spores of Phragmidium. (Plate III. fig. 37.) 



Lecythea Poterii, Lev. Burnet Rust ; spots obliterated, 

 rufous on the opposite side ; sori subrotund, scattered, minute on 

 the under surface ; epidermis bursting ; spores subglobose, often 

 pedicellate, intense orange; barren spores pale, cylindrical, and 

 slightly curved. — On Poterium Sanguisorba. Summer. Common. 

 Uredo spores of Xenodochus carbonarius. (Plate 111. fig. 31.) 



Lecythea Populina, Lev. Poplar Rust; hypogenous; 

 sori Yellow, roundish or oblong, surrounded by the ruptured 

 epidermis ; spores copious, elongated or ovate.— On Poplar and 

 Birch leaves. Summer. Common. Uredo spores of Melampsora 

 populina. 



Lecythea Euphorbise, Lev. Spurge Rust ; spots oblite- 

 rated ; sori subrotund, small, scattered, surrounded by the 

 ruptured epidermis ; barren spores pyriform or subglobose, pedi- 

 cellate ; fertile spores subglobose, orange. — On the under suface 

 of the leaves of various species of Euphorbia, especially E. helio- 

 scopia and E.Peplus. August. Very common. Uredo spores of 

 Melampsora Euphorbia. 



Lecythea epitea, Lev. Tawny Willow Rust; sori 

 roundish, scattered, at first tawny, at length growing pale, sur- 

 rounded by the ruptured epidermis ; spores subrotund and pyri- 

 form.— On the under suface of Willow-leaves. 



Lecythea mixta, Lev. Ouange Willow Rust; spots 

 yellow ; sori subrotund, aggregate, confluent, effuse, permanently 

 surrounded by the ruptured epidermis ; spores oblong and pyri- 

 form, orange. — On both surfaces of the leaves of Willows. 



Lecythea Saliceti, Lev. Common Willow Rust; spots 

 yellowish ; sori subrotund, solitary, or in circles, surrounded by 

 the ruptured epidermis ; barren spores subglobose and pedicellate 



