Tab. XXV. 



A. Dickson lA sorbifolia, Sm. — p. 72. 



Fig. 1 . Portion of a sterile frond ; nat. size. Fig. 2. Portion 

 of a sterile pinna, to show the venation ; magnified. Fig. 

 3. Portion of a fertile frond ; nat. size Fig. 4. Portion 

 of a pinna from the same with two sori ; magnified. 



B. Dicksonia Lindeni, Hook. — p. 72. 



Fig. 1. Portion of a fertile frond; nat. size. Fig. 2. Portions 

 of pinnae with sori ; magnified. 



