on British Ferns. 
XXV 
Genus. — Cystopteris, Bernliardi. 
Mid-vein of ultimate divisions distinct but sinuous, late- 
ral veins branched, free : involucre attached almost be- 
neath the mass of capsules, half-way between the mid-vein 
and the extremity, directed at first backwards, then up- 
wards, then forwards, and almost covering the circular 
mass of young capsules like a hood, its anterior margin 
split into unequal and often capillary segments. 
Cystopteris (montana) Allioni. 
1789. Polypodium montanum, Allion. Pedem. n. 2410. 
Cyathea montana, Both , Flor. Germ. iii. 100. 
Cystopteris montana (Link), Newm. Phytol. i. 671, N. A. 
15, F. 13 & 159 ; Hook, and Am. 572 ; Bab. 413. 
Rhizoma creeping ; stipes erect, longer than the frond ; 
frond deltoid. 
Apparently a rare, certainly a local fern ; hitherto ob- 
served only in Scotland. Found in 1836 on Ben Lawers, 
by Mr. W. Wilson : in a ravine called Corrach Dli’Oufil- 
lach, in 1841, by Messrs. W. Gourlie and W. Adamson: 
in the same place by Mr. Borrer and Dr. Walker-Arnott in 
1850 : and again by the Rev. W. Little in 1851. 
Obs . — I think the name of Polypodium montanum was given to this 
plant against all the rales of botanical nomenclature, Vogler having 
given that name to another species eight years previously. 
Cystopteris fragieis. 
Polypodium fragile, Linn. Sp. PI. 1553 ; Light f. FI. Scot. 
677 ; Huds. FI. Ang. 459 ; Bolt. Fil. Brit. 50, t. 27 & 
46; With. Arr. 779. 
1762. Polypodium rlueticum, Huds. FI. Ang. 458 ; With. 
Arr. 780 ; Bolt. Fil. Brit, part ii. 80, t. 45, but certain- 
ly not of Linn. Sp. PI. 1552, as cited by early English 
authors. 
1779. Polypodium polymorphum, Villars, Dauph. iii. 847. 
1793. Polypodium dentatum, Dicks. Crypt, fasc. iii. 1, t. 7, 
f. 1, Id. H. Sicc. fasc. 16 ; With, Arr. 776. 
1796. Polypodium trifidum, With. Arr. 779. 
appendix iv. D 
