368 



UREDINKAE. 



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

 Uredo- and teleutospores on leaves of Salix Gaprca and several 

 other species. According to Eostrup, Ocmmia cuonumi (Gmel.) 

 is a stage of this.^ 



M. Hartigii Tlulni.- {M. cpitca Thlini.) (J^riLain and U.S. 

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

 S. dnphnoides, S. viminalis, etc. Eostrup regards C. ribcsii Lk. 

 of liibcs as a cacoma -iovm. 



Fig. 200.— Milamijsorii salicis-mpr((i<. Section through leaf of Salix Caprca, 

 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. (After 

 Tulasne.) 



M. repentis Plowr.^ Uredo- and teleutospores on Salir repens. Caeoma 

 oil OrcIiiH marulata. (The Caeoma orchidis of other orcliids is probably 

 identical with this one.) 



M. arctica Rostr. on Salix Iterhacea, S. glauat, and S. groenlaiidiva in 

 Greenland. 



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



Thiinien also gives M. Castagnei Thlini. on .S". amygdalina. 



M. viteliinae D. C. on Salix fragilis is said by Schi'oeter to have its 

 Caeoma on Galanthus nivalis (Britain). 



The rusts of cultivated willows are very detrimental to them 



'J/. Haliris-capreae [M . va})rearum D.C.) is divided by some autliorities into 

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



-.See Thiunen, ''Mel. salicina,^' Mittheilungen o-im d. for.'<tlkh. Vemiwhswesen. 

 Oesterreir.h, 1879. 



■'Plowriglit {/oc. cit.). 



