FIG. 12. Plowrightia morbosa, a fungus with a large, irregu- 

 larly shaped black stroma in the substance of which numerous 

 perithecia containing spores are immersed, i, portion of a 

 branch of a plum-tree bearing a stroma of the fungus covered 

 with conidia ; 2, portion of a branch with a stroma of older 

 date and bearing perithecia ; 3, conidiophores with conidia 

 near the tip ; 4, ascus containing eight ascospores : by its side is 

 a paraphysis. Figs, i and 2, half nat. size ; the others mag. 



