ON" A FUNGUS DISEASE OF THE CHERRY LAUREL. 



143 



shcots are bearing new leaves. It was noticeable that in all cases the 

 mildew died away as the leaf grew older ; in old leaves the places 



Fig. 36. 



a. Two conidiophores : one (to right) immature ; one (to left) mature, with 

 chain of conidia. b. Four isolated ripe conidia. showing the fibrosin bodies, 

 c. Portion of a leaf of cherry laurel attacked by the mildew, showing 

 the formation of the haustoria (7n in the epidermal cells (the hyphae of 

 the mycelium have been removed I. All the figures x 400. 



previously attacked (when the leaf was young) could be recognised by the 

 brown patches of periderm which the leaf had formed over the injured 



