on British Ferns. xxv 



Genus. — Cystopteris, Bernhardi. 



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. Peclem. n. 2410. 

 Cyathea montana, Roth, Flor. Germ. iii. 100. 

 Cystoi3teris montana {Link), Neivm. Phytol. i. 671, N. A. 

 15, F. 13 & 159 ; Hook, and Am. 572 ; Bah. 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 Dh'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. - 



Ohs. — I think the name of Polypodium montanum was given to this 

 plant against all the rules of botanical nomenclature, Vogler having 

 given that name to another species eight yeai's previously. 



Cystopteris fragilis. 



Polypodium fragile, Linn. Sp. PI. 1553 ; Light/. Fl. Scot. 

 677 ; Huds. Fl. Ang. 459 ; Bolt. Fil. Brit. 50, t. 27 & 

 46 ; With. Arr. 779. 



1762. Polj-podium rhseticum, Huds. Fl. 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. Pol3^odium polymorphum, Villars, Dauph. iii. 847. 



1793. Polypodium dentatum, Dicks. Crypt, fasc. iii. 1, t. 7, 

 f. 1, Id. H Sice. fasc. 16 ; With. Arr. 776. 



1796. Polypodium trifidum, With. Arr. 779. 



appendix IV. D 



