Cistopteris .] 
FERNS. 
21 
rise to many oblong fronds, from two to four inches high. Lower 
half of the stem covered with light brown capillary scales, and about 
eight or ten pairs of pinnae, only the two or three lower pair opposite, 
and these not constantly so, all nearly smooth, bluntly triangular, 
deeply crenate, or cut into two or three segments on each side. 
The upper half of each pinna larger than the other, and in luxurious 
specimens cut into lobes near the stem. Sori from six to ten on 
each pinna, placed near the edge, light brown, very large, and there- 
fore often confluent. 
From the very numerous segments of the indusium, a sorus appears like a 
bunch of hairs. The discriminating character is, however, chiefly the less cut, 
shorter, and more alternate pinnce. The plant known as Woodsia Hyperborea 
by gardeners is in reality a large variety of Woodsia Ilvensis, known as such 
before the separation of the present from that species. 
Sit. — Found only on the highest rocks and mountains of Wales & Scotland. 
Hab. — Ben Lawcrs, Dr. Murray and Mr. W. Wilson. Clova Mountains, 
Mr. G. Don. Glen of the Dole, Clova, Mr. Brand, and Mr. Watson. Craig 
of the Chailleach, Perthsh., Mr. Maughan. Mael Ghyrdy, Pertlish., on 
Snowdon, below Bulch-y-Sactli (Clogwyn-y-Garnedd), at an elevation of 
2500 feet and upwards, very sparingly, Mr. W. Wilson. 
Note: — Mr. C. C. Babington says, “ I was not able to find this plant on 
Glydr Fown, Caernarvonshire, July 1835, although in company with J. 
Roberts, Esq., of Bangor, who knew its station well. It is, I fear, exter- 
minated in that place. 
Geo. — Lapland, Germany ? France? (Swz.) Lulca, in LaplandfNprewy.J 
Canada, and high mountains of Pensylvania and Virginia. 
CISTOPTERIS, Bern. BLADDER-FERN. 
(xLcrlo;, a bladder, w7tptf, a fern ; the indusiums being like bladders.) 
This genus is distinguished by its indusiums being inflated like bags, not being 
attached by a central column, but only by the outer edge, tearing irregularly, and 
finally, either quite bent back or thrown off altogether . They first open on the 
top, or on the side nearest the apex of the frond or pinna. 
1.— CISTOPTERIS DENTATA. 
TOOTHED BLADDER FERN. 
(Plate 1, fig. 9, 10.) 
Ciia. Frond bipinnate, oblong, lanceolate. Pinnae ovate, 
lanceolate. Pinnules ovate, obtuse, crenate. Sori distinct. 
Syn. — Cystea dentata, Eng. Flo . — Cyatliea dentata, Eng. Bot., Dav.W. Bot. 
Gulp . — Polypodium dentatum, Dicks., With., Hull . — Aspidium dent., 
Swz., Willd., Hook, in FI. Sco., Decan . — Athyrium dentatum, Gray. 
F ig . — E.B. 1588. — Pluk. Phyt. 179,/. 5 (a cultivated specimen) . — Bolt 27. 
Des. — R oot tufted, black, fibrous. Fronds numerous, oblong, 
lanceolate, six to nine inches high, deciduous. Stem slender, 
smooth, green, except at the lower part, winged near the apex, 
