THE BLADDER FERNS. 
217 
such soil and subject to such conditions — you place 
it in a cool stony nook of your rockery, or in 
pots, indoors, it will equally thrive. If you grow 
it in pots, plant it amongst some stones, not for- 
getting, however, to give it the appropriate soil. 
The more nearly you can approach, in your treat- 
ment of it, its natural conditions of growth, the 
more certain is your prospect of successfully culti- 
vating it. 
2. THE ALPINE BLADDER FERN. 
Cystopteris regia. 
This is an exceedingly rare species of the British 
Ferns. Similar in some respects to the Brittle 
Bladder Fern, it differs from the latter chiefly in 
size, growing ordinarily to a height of only four 
or five inches ; but sometimes becoming a few 
inches taller. It has a short brittle stem, some- 
what scaly at the part nearest the ground. In 
this species the branches of the frond, although 
similar to those of Fragilis, are placed more di- 
rectly opposite each other. The stipes is shorter 
