EXPLANATION OF THE PLATES. 



PLATES V-VII. POLYPODY. Polypodium vulgare. Plate V. 1-6. Young 

 leaves and plants in early stages of development. Plate VI. i, 2. Young 

 leaves in later stages of development, i. Leaf with epidermis removed, 

 showing venation. Plate VII. i. Mature fertile leaf. 2. Fertile pinna, 

 X 2. 



