EXPLANATION OF PLATE XVIII. 



CAMPTOSORUS. Plant of C. rhizophyllus, and (1) a portion of a frond, 

 with fruit-dots, enlarged. 



SCOLOPENDRIUM. Tip of a fertile frond of S. vulgare; and (2) a piece 

 enlarged, with two fruit-dots. 



ASPLENIUM. (1) A pinna of A. thelypteroides ; and (2) part of a lobe in 

 fruit, enlarged. 



DICKSONIA. (1) Pinna of D. pilosiuscula ; (2) portion of a pinnule, en- 

 larged; and (3) a fruit-dot in its cup-shaped indusium. 



