450 



Poll/podium calcareum. Plentiful on Anston-rocks, /. Hardy : abundant on our 

 hills near Settle, J.Talham: neighbourhood of Settle, where the plants are smaller 

 than those from Lancashire, .S'. Gibson : hills above Settle ; this species is exceedingly 

 distinct from Dryopteris when growing (J. Backhouse, jun.), R. Spruce : Inglebo- 

 rough with P. Dryopteris, W. Wilson; Ingleborough, (W. W. Brunton), from whom 

 I have a specimen which is eight inches from tip to tip of the lowest pinna3, and seven 

 and a half from the base of the lowest pinnas to the apex of the frond, S. Thompson : 

 Arncliffe and Gordale (R. B. Bowman), //. C. Watson : several places in Gordale, 

 Bainess Yorkshire Flora. 



f Woodsia Ilvensis. Richmond (J. Wood), Francis' 'Analysis of British Ferns.' 



Cj'stopteris fragilis. Uncommon in the neighbourhood of Sheffield, J. Hardy ,- 

 Shibden and Beeston woods near Halifax, Settle, Knaresborough, and many other 

 places in the county. The genus Cystopteris is said to affect limestone, but I always 

 find the varieties growing much larger, and their forms better displayed, where there 

 is no limestone. Mr. Francis lays great stress on the length of the rachis as a charac- 

 ter whereby to distinguish the species ; if he had been a fern-collector he would have 

 known that this character depends very much on the situation in which the plant hap- 

 pens to grow, if, for instance, among loose stones, the rachis will be long, if on a mor- 

 tared wall, short. The same author also remarks that C. dentata is only half the size 

 of C. fragilis, and double the size of C. alpina : my specimens of the form called fra- 

 gilis vary from 2 to 18 inches in length, of that called dentata from 4 to 16 inches, 

 and of the Low Layton plant from 1 to 8 inches ; S. Gibson : Shibden-dale near Ha- 

 lifax (R. Leyland), H. C. Watson; on the obelisk-bridge, Castle-Howard park; on 

 old walls &c. in various parts of the north-eastern moors ; near Helmsley, and in the 

 long walk, Knaresborough (T. B. Powell); sparingly in Teesdale, growing in caves 

 along with C. dentata, but keeping perfectly distinct in its habit, appearance of fronds 

 &c. (J. Backhouse, jun.), R. Spruce; near Rievaulx-abbey , Helmsley, H. Ibbotson ; 

 abundant at Eggleston-bridge on the banks of the Greta, Red-scar, Applegarth ; — 

 Baines^s Yorkshire Flora. 



Cystopteris dentata. Very common near Settle, J. Tatham ; Settle and other pla- 

 ces, S. Gibson ; Egglestone-abbey bridge, and many other places in Teesdale, very 

 fine (J. Backhouse, jun.), R. Spruce. 



Cystopteris angustata. Scarce in three places, Gordale and Attermine scars and 

 Catterick-force, J. Tatham ; I have found this variety growing on the very same plant 

 with C. dentata, at . Lune-bridge, Teesdale; they are no doubt the same species, (J. 

 Backhouse, jun.), R. Spruce: near Aysgarth-bridge, Wensley-dale, Baines's Yorkshire 

 Flora. 



Cystopteris alpina ovregia. Near Fountain's-abbey, and on wet rocks about Knares- 

 borough, according to Teesdale in the ' Linnean Transactions,' and in Baines's York- 

 shire Flora it is said to grow near Coxwold, but I have seen specimens from none of 

 these localities, R. Spruce. 



Polystichum aculeatum. Not common near Sheffield, J. Hardy ; near Triangle, 

 four miles from Halifax, and Highgreen woods, S. Gibson ; woods near Halifax, 

 (R. Leyland), H. C. Watson; Whits toncliff, near Thirsk; on the magnesian lime- 

 stone at Thorpe-arch and other places (J. Backhouse jun.), R. Spruce ; Thorpe-arch 

 (J. Ellis), /S'. Thompson. 



Polystichum angulare. Edlington-wood near Doncaster, not common, /. Hardy , 

 in endless variety in Beestou-woods, about seven miles north-east of Halifax, Shibden 



