IN- 1NII.A. 



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appendages having hooked tips. Within the perithecia art- 

 found the ovoid asci containing the spores; there are from four 

 to ten asci in each perithecium, ami four ti> ei-ht spores in each 

 ascus. 



The conidial stage was formerly known a- '>,-/////// '/'//</.,,;. 

 The conidia are al> jointed as oval colourless bodies from simple 

 septate conidiophores, to the numlier of two or three in each chain. 

 They -rniiiiate at once, and as they are formed in large numl>ei- 

 especially in moist weather, the disease spreads rapidly. Tin 

 mycelium is non-septate, or almost so, and attaches itself to the 

 epidermal cells of vine-leaves and young grapes, liy lobed attach- 

 ment-discs, from which simple sac-like haustoria make their way 



I'll., i . IVritlic. i:i. (Alt, i i 



into the cells. The mycelium forms while spots, hut after .. 



time causes the de;(tll of cells Hear it, so that hl'oWll withered 



>po[< appear. The leave- -em-rally wither, the -rape-, howevei . 

 eoiitimie to -row at the places not attacked, till rupture of the 

 COal ensues, then they shrivel up or tall a pre\ to moiild-1'un-i. 

 Sulphur is tin- preventive -em-rally used (See p. ITlh. 



Uncinula aceris I >. C. ( I'.ritain). This appears as white spotv 

 ill the leaves of species of Ai',,\ native and cultivated. When 

 attacked hy this mililew, young uiifoldin-.- leaves are stunted in 

 Ath, while oldei leaves in autumn still retain their cld"|-.. 



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