EXPLAN^ATION OF PLATE XIX. 



CYSTOPTERIS. — (1) Piece of the frond of C. bulbifera ; (2) a lobe in fruit, 



enlarged; and (3) a small portion more magnified, bearing a fruit-dot 



with its indusium thrown back. 

 WOODSIA. — (1) Small frond of W. glabella; (2) a part of a fruiting pinna 



of the same, magnified; and (3) a separate indusium, more magnified; 



(4) a piece of a fruitful pinnule of W. obtusa, enlarged; and (5) a fruit 



with the opened indusium beneath, more magnified. 

 ASPIDIUM. — (1) Pinna of A. (Dryopteris) marginale; and (2) a magnified 



fruiting portion; (3) piece of A. (Poljstichum) acrostichoides ; and (4) a 



small fruiting portion, magnified. 

 ONOCLEA. — Sterile and fertile frond of 0. sensibilis ; (1) front view of a 



fruiting contracted pinnule, enlarged; and (2) the same laid open and 



viewed from the other side ; on one lobe the sporangia are removed from 



the veina- 



