EXPLANATION OF THE PLATES. 

 Plates XVI, XVII. — Ebony Spleenwort. Asplenium platyneuron. 

 Plate XVI. — I. Young plant attached to prothallus. 4. Slightly older plant. 

 2-1 1. Young leaves in difiEerent stages of development. Plate XVII. — i. 

 Mature fertile plant, sUghtly reduced. 2. Section of highly developed mature 

 fertile leaf, slightly reduced. 3. Fertile pinna of less highly developed mature 

 leaf, X if. 



