EXPLANATION OF THE PLATES. 
Prates XTI-XIV.—NARROW-LEAVED SPLEENWORT. Asplenium angusti- 
folium. Plate XII.—1. 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.—1. Mature sterile leaf. 2. Section of fertile 
pinna of mature leaf, X 24. 
