18 POLYPODIUM. 



ing horizontally along underground (Vulgare, however, 

 rather on the surface), are not only somewhat more 

 difficult of removal than when they are tufted, but 

 throw out their fronds more arbitrarily, here and 

 there, apart from the site originally chosen for them. 

 They, however, hereby propagate more extensively, and 

 are better protected from the weather. 



PHEGOPTERIS. (Mountain or Beech 



Polypody.) Fig. 41. From 6 to 14 inches. 

 Pale green. Pinnae opposite, the lowest 

 pair inclining downwards ; quasi-pinnae on 

 the upper portion of the frond uniting 

 together at their base, and connected with 

 the stem by an increased breadth ol 

 foliage. Pinnulets simple, oblong, rounded, 

 thin, succulent, fringed with woolly hair, 

 and slightly uneven on their edges. Sori 

 marginal. May. Deciduous. Rocky, 

 damp, sheltered, places, and stony woods, 

 chiefly in the North. Prefers shade and 

 moisture. 



VULGARE. (Common Polypody.) 



Fig. 42. From 6 to 16 inches. To be 

 met with almost everywhere on trees and 

 walls, hanging down in tresses, with plain, 

 long, narrow, smooth, simple, alternate, 

 quasi-pinnse, sometimes slightly waved on 

 the edges, joined together at the base. 

 Sori prominent, white, ripening into yel- 

 low, in two series equi- distant from the 



