368 UREDINEAE. 



M. salicis-capreae (Pers.) (Britain and U.S. America). 

 Uredo- and teleutospores on leaves of Salix Caprea and several 

 other species. According to Eostrup, OasorrM euonymi (Gmel.) 

 is a stage of this.^ 



M. Hartigii Thiim."^ {M. epitea Thtim.) (Britain and U.S. 

 America). Uredo- and teleutospores on leaves of Scdix pruinosa. 

 S. daphnoides, S. mminalis, etc. Eostrup regards C rihesii Lk. 

 of Ribes as a caeoma-form. 



Pig. 200. — Melampsora salicis-capi-eae. Section thiough leaf of Salix Caprea^ 

 with a uredospore-sorus on the lower epidermis ; on the upper side a teleutospore- 

 sorus is in process of development, but is as yet completely closed over. (Aiter 

 Tulasne.) 



M. repentis Plowr.^ Uredo- and teleutospores on Salix repens. Caemna 

 on Orchis inaculata. (The Caeoma orchidis of other orchids is probably 

 identical with this one.) 



M. arctica Bostr. on Salix herhacea, 8. glaiica, and 5. groenlandica in 

 Greenland. 



M. mixta (Schlecht). (Britain). The related Caeoma is unknown. 



Thumen also gives M. Castagnei Thiim. on S. amygdalina. 



M. vitellinae D. C. on Salix fragilis is said by Schroeter to have its 

 Caeoma on Galamthus nivalis (Britain). 



The rusts of cultivated willows are very detrimental to them 



^ M. salicis-capreae (M. caprearum D.C.) is divided by some authorities into 

 M.fariiiosa (Pers.) and M. epitea (Kze. et Schni.). 



-See Thumen, "Mel. sodicina," Alittheilungen aus d. forstlich. Versuchswesen. 

 Oesterreich, 1879. 



^ Plowright (loc. cit. ). 



