Aspleuium.} CRYPTOfxAMIA — FILICES. 387 



Lawers. — This is certainly the most common Cistopteris in Wales, 

 where it seems to hold the place that Cfragilis does in Scotland, and 

 from which it may be distinct. 1 possess specimens of Ci/stea dentata 

 and C. angustata from Mr Dickson, and I can find no difference ; ex- 

 cept that the latter is a little broader in the frond than the former, and 

 perhaps the pinnules are rather more divided, so as to approach nearer 

 to the following species. This is the same as the Aspidium tenue of 

 American Botanists. 



2. C. frdgilis, Bernli. (brittle Slndder-Fern) ; fronds bipin- 

 nate, pinnae ovato-lanceolate, pinnules ovato-lanceolate deeply 

 pinnatifid, segments ovate or lanceolate toothed, rachis winged. 

 — Cystea, E. Fl. v, iv. p. ii98. — Aspidium, Stv. — Cyathea, E. 

 Bot. t. 1587. 



Rocks and walls, in the mountainous parts of great Britain. Most 

 abundant in Scotland. — It will be seen that this principally differs from 

 the preceding, in its more divided /?2M?i« and narrower segments. 



3. C. alpina, Desv. (laciniated Bladder- Fern) ; fronds tri- 

 pinnate,"pinnules confluent ovato-oblong pinnatifid rather spread- 

 ing, the segments broadly and shortly linear obtuse, with 2 or 

 3 blunt erect teeth, rachis winged. — Aspidiwn, Sw. Willd. — 

 Polypodium, Jacq. Ic. v. iii. t. 642, (excellent). — Cystea regia, 



E. FL V. iv. p. 302, (excl. the alpine stations). — Cyathea regia, 

 Forst.—Fl. Br. p. 1140.— C. incisa, E. Bot t. 163. 



On a wall (since destroyed) at Low Layton, Essex, plentiful; MrT. 



F. Forster. — Having received authentic specimens of the Layton plant, 

 from Mr E. Forster, and compared them with continental ones, and 

 with figures and descriptions of Asjndium alpinum, Sw. especially the 

 plates of Jacquin and Schkuhr, I can, without hesitation, pronounce 

 them to be identical.* 



6. AsPLENiUM. Linn. Spleenwort. 



L A. septentriondle, Hull, (forked Spleemvort) ; fronds bipar- 

 tite, segments linear acutely 3-toothed at the extremity. E. 

 Bot. t. 1007. — Acrostichum, L. 



Clefts of rocks, in mountainous parts of the north, Caernarvonshire. 

 Near Llyn-y-Cwn, N. Wales, Mr W. Wilson. On Ingleborough and at 

 Ambleside. Arthur's seat, Edinburgh, plentiful. Stenton rock, Dunkeld. 



2. A. alternifdlium, Wulf. (^alternate-leaved Spleemvort); fronds 

 pinnate, pinnee alternate lanceolato-cuneate toothed at the apex, 

 lower ones trifid and toothed, involucre entire. E. Bot. t. 2238. 

 — A. Germanicnm, Willd. 



Rocks, Scotland, very rare. Near Kelso, Mr Dickson ; and near 

 Perth, Mr Bishop, Br M'Nah. 3 m. from Dunfermline, Dr A. Bewar. 



3. A. Trichomanes, h.^comtnoji Wall Spleemvort); fronds pin- 



* Mr D. Don, Linn. Trans, v. xiii. p. 437, observes that lie cannot subscribe 

 to this opinion. I can only say that I have again made the comparison ; and 

 my specimens from the wall at Layton, given me by Mr Forster and Mr 

 Turner, and cultivated ones from IVlr Bree, are precisely the C. (tlpina of con-r 

 tinental Botanists. 



