EXPLANATION OF THE PLATES. 
Pirates V-VII.—Porypopy. Polypodium vulgare. Plate V.—1-6. Young 
leaves and plants in early stages of development. Plate VI.—1, 2. Young 
leaves in later stages of development. 1. Leaf with epidermis removed, 
showing venation. Plate VII.—1. Mature fertile leaf. 2. Fertile pinna, 
X 24. 
