Fig. 20. — Rosellinia radiciperda. i, Ascigerous stage of the fungus showing the 

 perithecia, natural size ; 2, perithecia enlarged ; 3, section of same, showing the 

 wall to consist of two layers ; 4, ascus containing spores, also paraphyses, X 300 ; 



[Description contin7<ed on p. 117. 



