46 THE HABIT AND THE HABITAT OF FERNS [CH. 



Fig- 53- Drynaria, showing epiphytic habit, and dimorphic leaves. A, B = D. qiiercifolia (L.), 

 Bory. In B the dimorphism is not yet fully developed, the plant being young. C = D. Baronii 

 (Christ), Diels. {A, B, after von Goebel; C, after Christ; from Engler and Prantl.) 



