EXPLANATION OF PLATE XIX. 



C YSTOPTERIS. ( 1 ) Piece of the frond of C. bulbif era ; (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 iudusium beneath, more magnified. 

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



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



small fruiting portion, magnified. 

 ONOCLEA. Sterile and fertile frond of O. 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 veins- 



