REVISION OF THE SCOTCH PERISPOUI VCKAK. 15 



seen in Ei-ysiphe ; and the mode of branchinj? of the bifurcated 

 tips is very different from that of a true Mkrosphaera. 



Oidium Balsamii Mont. {D. and R. Trail). 



Under this name has been described a funpfus that evidently 

 belongs to the genus Erysiplie, or to some very closely 

 allied genus ; although from the absence of perithecia, which 

 have not yet been detected, it is impossible to ascertain to what 

 species it belongs. The conidia seem to approach on the whole 

 very near to those of E. UvihelUferariun De Bary. It is of 

 considerable practical interest, since it attacks various cultivated 

 plants. Near Aberdeen I have seen ib in great plenty upon 

 turnips, preferring the Swedish to the common yellow turnip I 

 It seems to appear chiefly towards the end of autumn. An 

 excellent figure and description of it will be found in Mr. W. 

 G. Smith's Diseases of Field and Garden Crops, pp. 75-79. What 

 seems to be the same fungus has been observed in England on 

 Verbasciuu, and on cultivated strawberry plants. 



? Erysiphe Rubi Fuekel (D. ai.d R. Trail). 

 This name has been given to what seems to be the mvcelium 

 of an Erijsiphe (of which the perithecia are not yet known), 

 which forms a thin white coat on spots on leaves of Ruhus 

 Idaeus. It has been recorded from Germany, France, and 

 Portugal ; and in the autumn of 1888 I found a few examples 

 of it in the neighbourhood of Aberdeen. 



Genus 5. Uncinula Lev. 



10. U. Salicis (DC.) Winter {U. adunca Lev., M.S. 

 1829).— On leaves of species of Salix, in autumn. 

 Fortli, Moray. 

 England, Europe, Siberia, N. America. 



17. U. Prunastri (DC.) Sacc. (U. Wallrothii Lev., 

 M.S. 1828).— On leaves of Primus spinosa, in autumn. 



Tay, Moray. 



England, Central and Southern Europe. 



18. U. Aceris (D.C.) Sacc. {U. bicomis Lev., M.S. 

 1830).— On leaves of Acer Pseudo-platanus \ and of ^. 

 campestrel in autumn. 



Forth, Clyde! Tay! Dee! Moray! 

 England, Europe, Algeria. 



Genus G. Microsphaera Lev. 



19. M. Berberidis (D.C), Lev. (M.S. 1834).— On 

 leaves of Berheris vulgaris, in autumn. 



