CHAPTER YI. 
THE POLYPODIES. 
Plate 2 . 
HE 4 many-footed 5 Ferns-—as tlie 
Trords of Greek origin, from vrliicli 
the generic name Polypodium is 
compounded, imply—form a pretty 
and interesting group, including in tlie British. 
Islands five members, namely:—1. The Common 
Polypody ( Polypodium vulgctre). 2. The Moun¬ 
tain Polypody {Polypodium phegopteris). 3. The 
Three-branched Polypody ( Polypodium dryo- 
pteris). 4. The Limestone Polypody (Polypodium 
calcar eum). And 5. The Alpine Polypody (Poly- 
podium alpestre) . The rhizomas of these Ferns— 
creeping and branching in various directions, 
u 
