30 _ ferns. [Cistopteris. 
spring occasions barren fronds, the pinnules of which are rounded, delicate, wide, 
creuate, 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. Pinnae 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 
coloured pinnules ; in this case exactly resembling the cultivated Cistopteris 
dentata, except in the shape of the frond itself. 
f3 ( angustata ). Frond oblong, ovate. Pinnae ovate, pointed. 
Cyathea angustata, E. B. and E. F. — Polypodium rliaeticum, Dick., Bolt . — 
Aspidium rliaeticum, Willd. — By no means the Polypodium rhaeti. of 
Linnceus, nor the Polypodium tenue of Iloffm., 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. — On alpine rocks and other lofty situations. 
Hab. — Eng. : Near Richmond, Yorks., Mr. J. Ward. About Settle, Yorks., 
Mr. J. Tatham. Cumberland, Ruins of Peveril Castle, Castleton, and the Lover’s 
Leap, near Buxton, Derbys., Mr. H. C. Watson. Matlock, Derbys., Dr. Howilt. 
Cheddar, Somers., Mr. W. C. Trevelyan. Nottinghamsh., Mr. T. H. Cooper. 
Near Bristol, Miss Worsley. At Exwick, near Exeter, Mr. Jacob. — Wales: Cave 
at Clogwyn Coch, Snowdon, and rocks above Cwm Idwel, near Twll Du, Mr. W. 
Wilson. Near Wrexham, Denbighsli., Mr. J. E. Bowman. — Scot.: Aberdeen- 
shire, Mr. II. C. Watson. Moray and Ross-shire, 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 Derry clare, Connamara, Mr. Shuttleworth. 
Geo. — Common in Germany, Saxony, Switzerland, Holland, &c. 
3.— CISTOPTERIS ALPINA. 
ALPINE BLADDER-FERN. LACINIATED BLADDER-FERN. 
(Plate II, fig. 3.) 
Cha. — Frond tri-pinnate, ovate, lanceolate. Pinnules ovate, 
blunt. Segments linear, obtuse, toothed. 
Syn. — Cistopteris alpina, Hook, in Br. FI., Desv. — Cistopteris regia, Bemh . — 
Cyathea incisa, Smith in E. Bot., Galp. — Cyathea alpina, Roth. — Cystea 
regia, Smith in E. FI. and FI. Br. — Polypodium regium, Linn., Hull . — 
Polypodium trifidum, With. • — Polvpodium alpinum, .fact/., Schk. — 
Athvrium alpinum, Spreny. — Athyrium regium, Gray. — Aspidium alpinum , 
Swz., Willd., Hook., in FI. Sco. 
Fig. — E. B. 163. — Jacq. Icon. vol. iii, t. 742. — Seguier PI. Veron. supp. 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 tlicir width. Larger pinnules broadly 
