FUNGOID PESTS OF CULTIVATED PLANTS. 221 



Willow Leaf-spot. 

 Septoria salicicola (Fries), PI. XXI. fig. 38. 



This spot is generally found on the leaves of Salix cinerea and S. 

 viminalis, but it occurs also upon other species. The spots are rounded 

 and white with a brownish margin, upon which are scattered the minute 

 and dot-like black receptacles. The sporules are rod-like and curved 

 (10-50 x 3 fx), with three transverse septa. 



Recognised also in Sweden, France, Austria, Italy, and Siberia. 



Sacc. Syll. hi. 2711 ; Grevillea, xiv. 101, No. 484. 



Septoria salicella (Berk.) is now called Bhabdospora salicella, and 

 appears to be confined to dead twigs and branches. 



Osier Rust. 

 Melampsora Vitellines (DC), PI. XXL fig. 39. 



This rust is found on both surfaces of the leaves of Salix pentandra 

 fragilis, triandra, viminalis, and vitellina. The uredo appears to be the 

 only stage which is perfectly known, and this was originally called Uredo 

 Vitellina and Lecythea saliceti. 



The pustules of the uredo are small, round, soon becoming powdery, 

 and golden-yellow. The spores are elliptical or ovate, rough, and orange 

 (25-28 x 15-20 /u), mixed with globose paraphyses attenuated at the 

 base. 



The teleutospores are said to be confined to the under surface, and 

 occur in small crusts, at length dark brown. 



Reported in France, Belgium, Germany, Italy, and Asiatic Siberia. 



These species of Melampsora on Willows appear to be sadly in need of 

 thorough investigation and disentanglement. 



Sacc. Syll. vii. 2110 ; Plotor. Brit. Ured. p. 240 ; Cooke, Hdbk. No. 

 1593 ; Cooke, M. F. p. 221. 



Purple Willow Rust. 

 Melampsora mixta (Thum.), PI. XXL fig. 40. 



This fungus is found on the leaves of Salix triandra from May to 

 November. The uredo was formerly known as Lecythea mixta. There 

 is at present no insinuation as to its cluster-cups. 



The pustules of the uredo are found on the under surface, and are 

 crowded and powdery, of an orange colour, larger, and sometimes con- 

 fluent when occurring on the young twigs. Spores elliptical or nearly so, 

 rough, and of an orange colour (14-18 x 12-15 /<), mixed abundantly 

 with capitate paraphyses. 



Teleutospores also on the under surface, in small blackish crusts. 



Has been found in France, Germany, Italy, and South Africa, and is 

 reputed to occur on Salix hastata and S. silesiaca. 



Sacc. Syll. vii. 2109; Plozvr. Brit. Ured. p. 239; Cooke, Hdbk. No. 

 1592 ; Cooke, M. F. p. 221. 



