APPENDIX. 221 



Leeythea Ruborum, Lev. Beamble 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 Phragmidmm. (Plate 

 III. fig. 40.) 



Leeythea Bosse, Lev. Rose Rust ; spots yellow, small, 

 scattered ; spores sub-oval, sometimes minutely pedicellate, 

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

 Uredo spores of Fhragmidium. (Plate III. flg. 37.) 



Leeythea Poterii, L6v. Btjknet 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 carbonatius. (Plate 111. fig. 31.) 



Leeythea Populina, L^v. Poplar Rust ; hypogenous ; 

 sori yellow, roundish or oblong, surrounded by the ruptured 

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

 Birch leaves. Summes-. Common. Uredo spores of Melampsora 

 populina. 



Leeythea Euphorbise, L^v. Spuege 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 B. helio- 

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



Leeythea epitea. Lev. Tavtnt 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 s(\rface of Willow-leaves. 



Leeythea mixta, L6v. Orange Willow Rust; spots 

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

 surrounded by the ruptured epidermis ; spores oblong and pyri- 

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



Leeythea Salieeti, Lev. Common Willow Rust; spots 

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

 the ruptured epidermis ; barren spores subglobose and pedicellate 



