EXPLANATION OF THE PLATES. 
Pirates XVI, XVII.—Esony SpLeeNwort. Asplenium platyneuron. 
Plate XVI.—1. Young plant attached to prothallus. 4. Slightly older plant. 
2-11. Young leaves in different stages of development. Plate XVII.—1. 
Mature fertile plant, slightly reduced. 2. Section of highly developed mature 
fertile leaf, slightly reduced. 3. Fertile pinna of less highly developed mature 
leaf, X 13. 
