CRYPTOGAMIA-FILICES. Cystea. SOS 



P. trifidum. mth.779. 



P. polymorphum C, regium. Villars Dauph. v. 3. 847. t.53.f. C. 



P. album p, Lcnn. Frmif. v. 1.21. 



Cyathea regia. Forst. in Sym. Syn. 194. Fl. Br. 1 140. 



C. incisa. Engl. Bot. v.'i.tA 63. 



Aspidium regium. Sw. Syn. Fil. 58. mild. Sp. PL r. 5. 28 1 . Hook. 



Scot. p. 2, 155. 

 Adiantum nigrum, pinnulis cicutariae divlsura. Raii Syn. cd. 2. 50. 



ed. 3. 126. 

 A. album tenuifolium, Rutse muiarice accedens. Bank. Hist. v. 3. 



.p. 2. 735./. 

 Filicula cambrobritannica, pinnulis cicutariee divisura donatis. 



3/om. 2?. 3.581. w. 31. 

 F. regia, fumarise pinnulis. Faill. Par. 52. t.O.f. 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 Lawers J 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 api)earance, 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 of C.fragilis. Leaves and leajlets more generally 

 alternate than opposite 3 the former witli a narrowly winged, or 

 bordered, mi(h-il) j the latter ovate, obtuse, deej)ly pinnatifid, 

 with eHii)tic-ob]ong, obtuse, partly cloven or notched segments, 

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

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

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

 nor do they aj)pear ever to become confluent, in a young state, 

 each is wra])ped uj) in a white, membranous, concave cover, 

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

 agreeing with C.fragilis, but the masses are much smaller, and 

 tlie capsules of a pale brown, never black. 



The lowland station of tiiis 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, mav be supj)osc(l 

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

 vain for any information on this head either in \'aillant or La- 

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

 Tlie 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. lie describes it as " varying 



