i 



^"ivii^i^^ 



Fig. 75. Part of an adult fertile 

 frond of the Holly Fern {Polysti- 

 chum Lonchitis (L.) Roth) from 

 Scotland. Natural size. 



Fig. 76. Part of an adult fertile frond of Polystichum angulare 

 Presl from Devon. Natural size. 



90 



