EXPLANATION OF PLATE XTX. 



CYSTOPTEIUS. (1) Piece of the IV 1 <>f ("'. bnlbifera; (-2) a lobe in fruit, 



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



with its indusium thrown hack. 

 WOODSIA. (1) Small frond of W. glahella; (2) a part of a fruiting |iinna 



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. (I)ryopteris) marginale ; and (2) a magnified 



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



small fruiting portion, magnified. 

 nNOCLEA. 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; oil one lobe the sporangia arc removed from 



the veins. 



