EXPLANATION OF THE PLATES. 



PLATES XII-XIV. NARROW-LEAVED SPLEENWORT. Asplenium angusti- 

 folium. Plate XII. i. Young plant attached to prothallus. 2-5. Young 

 leaves in early stages of development. Plate XIII. Young leaf in later stage 

 of development. Plate XIV. i. Mature sterile leaf. 2. Section of fertile 

 pinna of mature leaf, X 2^. 



