EXPLANATIOX OF PLATE XVIII. 



CAMPTOSOEUS. — Plant of C. rhizophyllns, and (1) a portion of a frond, 

 with fruit-dots, onlarf^ed. 



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

 enlarged, with two fruit-dots. 



ASPLENIUM. — (1) A ])inna of A. thelypteroides ; and (2) part of a lol)e in 

 fruit, enlarged. 



DICKSONIA. — (1) Pinna of I), pilosiuscula; (2) portion of a piiiiuilo, en- 

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



