fl 



W 5 



Fig. 24. Nectria ditissima. i, a branch recently 

 attacked, the disease entered at the axil of the small 

 branch ; a, a, perithecia ; 2, a branch that has been dis- 

 eased for some time, showing a rugged raised margin 

 round the wounds ; the end of the broken branch, a, is 

 the point where the fungus gained an entrance into the 

 branch ; 3, section through a stroma containing peri- 

 thecia, a, a, on its surface, x 30 ; 4, a single perithecium, 

 x 100 : 5, section of a perithecium, x 100 ; 6, portion of 

 a stroma bearing conidia, highly mag. (after Hartig) ; 

 7, a single conidium germinating, highly mag. (after 

 Hartig) ; 8, portion of the contents of a red perithecium ; 

 a, an ascus containing eight i-septate spores ; b, b, para- 

 physes, x 300. 



