58 FILMY FERN. 



texture, retain their appearance well, when dried, in 

 the herbarium. Both species may be distinguished 

 from other ferns by the matted growth of their 

 thread-like roots, and their thin membranous appear- 

 ance. 



This fern is not confined to the neighbourhood of 

 Tunbridge Wells, although, being first found there, it 

 was named accordingly. It grows in many parts of 

 the United Kingdom in mountainous and rocky dis- 

 tricts ; among moss on the trunks and roots of old 

 trees near lakes or rivulets ; and in many moist and 

 shady places. It is found in many parts of the 

 Continent ; and is everywhere a pleasing variety 

 amidst other ferns and wild plants. 



This species, according to Mr. Newman, prefers 

 shade, warmth, and shelter ; whilst its ally, H. uni- 

 laterale, establishes itself on bleak exposed situations. 



It can be grown successfully in the open air by 

 imitating its natural condition ; and under glass, if 

 certain conditions be attended to ; viz. a close atmo- 

 sphere, shade, moderate warmth, constant but not 

 stagnant moisture, and a porous surface. 



