xii LIST OF ILLUSTRATIONS. 



PAGE. 



ASPIDIUM. 309 



CYSTOPTERIS. 309 



WOODSIA. .......... 309 



DICKSONIA. .......... 310 



SCOLOPENDRIUM. ......... 310 



C.AMPTOSORUS. 310 



ASPLENIUM. ....... 310 



ATHYRIUM. 



310 



