206 MICROSCOPIC FUNGI. 



Lecythea, Lev, 



stroma surrounded or sprinkled with elongated abortive spores. 

 Spores free, invested with their mother-cell, or con- 

 catenate. — Berk, Out I., p. 334. 



* Spores free. 



Lecjrthea 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, echinutate, bright ochraceous- 

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

 August. Very common. (Plate III. fig. 40.) 



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

 scattered ; spores sub-oval, sometimes minutely pedicellate, 

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

 (Plate IIL 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 Foterium Sanguisorba. Summer. Common. 

 (Plate III. 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. 



Lecythea Euphorbise, Lev. Spurge Rust ; spots oblite- 

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

 ruptured epidermis; barren spores pyriform or subglobose, pe- 

 dicellate ; fertile spores subglobose, orange. — On the under sur- 

 face of the leaves of various species of Euphorbia, especially E. 

 helioscopia and E. peplus. August. Very common. 



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 surface of Willow-leaves. 



Lecythea mixta, Lev. Orange Willow Rust; spots 

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

 surrounded by the ruptured epidermis • spores oblong and pyri- 

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



