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FIG. jo.Uncinula spiralis, a destructive parasite to the vine, 

 i, conidial stage forming white patches on the upper surface of a 

 vine leaf; 2, part of a vine leaf with the ascigerous form of the 

 fungus ; 3, portion of mycelium bearing erect chains of conidia at 

 a, a ; and haustoria which penetrate into the living cells of the 

 leaf, b, b ; 4, a single free conidium ; 5, a perithecium with its 

 curled appendages ; 6, an ascus containing six spores ; 7, a free 

 ascospore; 8, grapes attacked by the fungus. Figs, i, 2, and 8, 

 somewhat reduced ; the remainder mag. 



