FERNS. 
30 
[Cistopteris. 
spring occasions barren fronds, tlie pinnules of which are rounded, delicate, wide, 
crenate, and running much into each other, while long-continued drought or warm 
weather occasions those fronds which arise in summer to be much smaller, much 
yellower, more entire, and the sori more crowded. In the extreme state it may 
be described as follows Frond linear, oblong. Pinme blunt, pinnate, ovate or 
round, toothed, quite covered with sori. If the summer continue very wet and 
cold, the fronds do not take the above character, but have broader and darker 
colored pinnules; in this case exactly resembling the cultivated Cistopteris 
dentata, except in the shape of the frond itself. 
I i . ( angustata .) Frond oblong, ovate. Pinnae ovate, pointed. 
Cyathea angustata. E. B. and E. F . — Polypodium rhieticum, Dick., Bolt.— 
Aspidium rhseticum, Willd .— By no means the Polypodium rlneti. ot 
Linn ecus, nor the Polypodium tenue of Hoffin., which is the Aspidium 
intermedium of modern authors. 
Very distinct as a variety, not a species. It differs from the usual state of the 
plant only in a rather larger and broader frond, with pinnules doubly toothed and 
slightly pointed. 
Sit. — O n alpine rocks and other lofty situations. 
IIab.— Eng. : Near Richmond, Yorks., Mr. J.Ward. About Settle, Yorks., 
Mr. J. Tat ham. Cumberland, Ruins of Peveril Castle, Castleton, and the Lover s 
Leap, near Buxton, Derbys., Mr. H. C. Watson. Matlock, Derbys ., Dr Howitt. 
Cheddar, Somers.,' Mr. W. C. Trevelyan. Nottinghamsh., Mr. T.H. Cooper. 
Near Bristol, Miss Worsley. At Exwick, near Exeter, Mr. Jacob.— \\ al. : Cave 
at Clogwyn Coch, Snowdon, and rocks above Cwn Idwel, near Twll Du, Mr. YV . 
Wilson. Near Wrexham, Denbiglish., Mr. J. E. Bowman. — Sco. : Aberdeen- 
shire Mr. II. C. Watson. Moray and Rosshire, Rev. G. Gordon. Near Maens, 
Berwicksh., Rev. A. Baird. Sutherland and the Kincardineshire Coast, Dr. 
Murray. Near Killin, Mr. W. Wilson.— Ire. : Rocks and mountains of Kerry, 
Mr. Mackay. Lough Inn, and Lough Derryclare, Cunnemara, Mr. Shuttleworth. 
Geo. — Common in Germany, Saxony, Switzerland, Holland, &c. 
3 .— CISTOPTERIS ALPINA. 
ALPINE BLADDBR-FERN. LACINIATED BLADDER-PERN. 
(Plate 2, fig. 3.) 
Cha. — Frond tri-pinnate, ovate, lanceolate. Pinnules ovate, 
blunt. Segments linear, obtuse, toothed. 
Syn. — C istopteris alpina, Hook. in. Br. FI., Desv . — Cistopteris regia, Bernh. 
Cyathea incisa, Smith in E. Bot., Galp . — Cyathea alpina, Roth. Cystea 
regia, Smith in E. Ft. S( FI. Br .— Polypodium regium, Linn., Hull.— 
Polypodium trifidum, With. Polypodium alpinum, Jacq., Schk. 
Athyrium alpinum, Spreng. Athyrium regium, Gray . — Aspidium 
alpinum, Swz. Willd., Hook, in FI. Sco. 
F ig , — E. B. 163. — Jacq. Icon. vol. 3 t. 742 . — Seguier PI. Veron. snpp. 1, 3. 
Des Root black, fibrous, tufted. Frond tri-pinnate, ovate, or 
ovato-lanceolate, herbaceous, 2 to 6 inches high. Pinnae about 
ten or twelve pairs, set rather alternately, except the lower pair, 
their length not above twice their width. Larger pinnules broadly 
