78 V. CVSTOPTERI3. 
waterfalls. It is apparently more rare in Ireland, though 
Mr. Newman found it in great profusion near Sligo, occur- 
ring not only on the limestone rocks and walls, but also in 
the hedge-rows, mingled with Scolopendrium vulgare. 
The same species (or what is considered to be such) is 
generally distributed throughout Europe, and in Asia, 
Africa, and North America, as well as the Islands of the 
Pacific. 
From the delicate texture of this fern, and its adaptabi- 
lity to various situations, it is well suited for cultivation ; 
and grows vigorously planted either on rockwork or in pots, 
and placed either within a frame or without one hi a shel- 
tered and shady position ; it however becomes most beautiful 
when developed in the damp close atmosphere of a frame 
or glazed case. The small size of the plant renders it 
more convenient for pot culture than many other kinds. 
The other species of Cystopteris are similar hi habit, and 
may be cultivated in the same manner. The dormant 
crowns should not be kept too damp during the winter. 
They all propagate readily by separating the crowns when- 
ever more than one is formed, and most of them form new 
crowns rapidly. 
2. Cystopteris alpina, Desvaux. Alpine Blad- 
der-fern. Fronds lanceolate sub-tripinnate ; pinnae ovate : 
pinnules ovate-oblong confluent deeply pinnatitid, the lobes 
broadly and shortly linear with two or three erect blunt 
teeth ; rachis winged. 
CTSTOPTEMS ALPIXA. Desvanx : Hook, and Arn. 572 : Hook. Sp. 
Fil L 199: Bab. M;in. 412: Franc. 30. C. KEGIA, Presl. C. FRAGILIS, 
$ Newm. 157. CTATHEA REOIA, Forster. CYATHEA ISCISA, Soi. 
Eng. Bot 163. CYSTEA REOIA, Sm. Eng. Fl iv. 289, In part 
1'OLTPODICM ALPINUM, Jacquin. POLTPODIUM KEGIUM, TJ|m 
ASPIDICM BEGIITM, SwOTtZ. 
The Alpine Bladder-fern is an extremely elegant little 
plant, with fronds more deeply divided than hi C. fragilis, 
