EXPLANATION OF THE PLATES. 

 Plates XII-XIV. — Narrow-Leaved Spleenwort. Asplenium angusti- 

 jolium. 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 XTV. — i. Mature sterile leaf. 2. Section of fertile 

 pinna of mature leaf, X 2^. 



