CRYPTOGAMIA-FILICES. Cystea. SOS 



P. tvifidum. M^ith. 779. 



P.polymorphum C, regium. Villars Dauph.v, 3.847. t. 53. f.C. 



P. album j3. Lam. Franf. v. 1.21. 



Cyathea vegia. Furst. in Sym. Syn. 194. Fl. Br. 1 140. 



C. incisa. Engl. Bot.v.3. t.\63. 



Aspidium regium. Sw. Sijn. Fil. 58, Willd. Sp. PL v. 5. 281 . Hook. 



Scot. p. 2. 155. 

 Adiantum nigrum^ pinnulis cicutarise divisura. Rail Syn. ed. 2.50. 



ed. 3. 126. 

 A. album tenuifolium, Rutse muvaiise accedens. Bauh. Hist. v. 3. 



P-2.735./. 



Filicula cambrobritannica, pinnulis cicutarise divisura donatis. 



Moris. V. 3.581. n. 31. 

 F. regia, fumarise pinnulis. Faill. Par. 52. t. 9./. 1 ; omitting the 



reference to Pona. 



On walls, as well as on lofty alpine rocks, but rare. 



On a wall at Low Layton, Essex, plentifully. Mr. T. F. Forster. 

 Upon Snowdon. Mr. Lhwyd. Found there by the Rev. H. Davies, 

 and Mr. W. Wilson. About Cwm Idwell. Mr. Griffith. On 

 Scottish mountain of Ben Lawersj Mr. Maughan. Hooker. 



Perennial. June. 



Root tufted, scaly. Fronds several, from three to ten or twelve 

 inches high, bright green, lanceolate, twice pinnate, pinnatifid 

 and finely cut, of a most elegant appearance, quite smooth in 

 every part, except a few membranous, torn, pointed, brown 

 scales, at the very bottom of the stalk, which is less brittle and 

 juicy than that oi C.fragilis. Leaves and leaflets more generally 

 alternate than opposite ; the former with a narrowly winged, or 

 bordered, midrib ; the latter ovate, obtuse, deeply pinnatifid, 

 with elliptic-oblong, obtuse, partly cloven or notched segments, 

 but not elongated, linear, or wavy at the margin like C. angus- 

 tata, neither are their ribs zigzag as in that species. Masses of 

 capsules very copious, but small, pale, scattered, not crowded, 

 nor do they appear ever to become confluent. In a young state, 

 each is wrapped up in a white, membranous, concave cover, 

 terminating in a tapering, more or less jagged, point, nearly 

 agreeing with Cfragilis, but the masses are much smaller, and 

 the capsules of a pale brown, never black. 

 The lowland station of this Fern, close to a much-frequented road 

 at Low Layton, where I have, in company with the late Mr. Fors- 

 ter, seen it covering great part of a brick wall, may be supposed 

 analogous to its places of growth in France ; but we seek in 

 vain for any information on this head either in Vaillant or La- 

 marck, nor is it evident that the latter ever found the plant. 

 The wall at Layton has been repaired, and the Fern almost 

 destroyed. On Snowdon it is said to be very scarce, though 

 Mr. Wilson, with his usual bounty, has sent me an ample sup- 

 ply of specimens of various sizes. He describes it as " varying 



