on British Ferns. x^vii 



Genus. — Woodsia, R. Br. 



Mid-vein of ultimate divisions indistinct, lateral veins 

 branched, free : involucre seated near the extremity of each 

 branch, its base inclosing the base of the capsules, its mar- 

 gin split into capillary segments, which mingle with the 

 capsules. 



Woodsia Ilvensis. 



? Acrostichum Ilvense, Linn. Sp. PL 1628. 



Acrostichum Ilvense, Huds. Fl. Ang. 451 ; Bolt. Fil. Brit. 



14, t. 9. 

 Poljrpodium arvonicum, With. Arr. 774. 

 Woodsia Ilvensis, R. Br. Tr. Linn. Soc. xi. 173 ; Sm. E. F. 



iv. 322, E. B. S. 2616; Newm. N. A. 13, F. 137; 



Hook, and Am. 567. 

 Woodsia Ilvensis, Bah. 409, ad partem. 



Rhizoma tufted ; stijpes sometimes as long as the frond, 

 but generally shorter, distinctly articulated towards the 

 base ; frond erect, lanceolate, pinnate ; pinnae oblong, sub- 

 opposite, lobed or pinnatifid, scaly. 



A very small and rare fern. Found on rocks in Caer- 

 narvonshire by Mr. W. Wilson ; in Durham by Mr. Back- 

 house ; in Forfarshire by Mr. Watson and Mr. Wilson. 



Woodsia alpina. 



Polypodium fontanum, Herb. Linn, certe. 



1776. Acrostichum Ilvense, With. Arr. 649. 



1790. Acrostichum alpinum, Bolt. Fil. Brit. 76, t. 42. 



1793. Acrostichum hyperboreum, Liljeblad, St. Tr. 201, t. 8. 



Woodsia hyperborea, jR. Br. Tr. Linn. Soc. xi. 173; Sm. 



E. F. iv. 323, ? E. B. 2023 ; Hook, and Am. 567. 

 Woodsia Ilvensis, Bab. 409, ad partem. 

 Woodsia alpina, Newm. N. A. 13, F. 143. 



Rhizoma tufted ; stipes shorter than the frond, articu- 

 lated ; frond narrow, linear, pinnate ; pinnae distant, del- 

 toid, blunt, lobed. 



A very small and rare fern. Found on rocks in Caer- 

 narvonshire and Perthshire by Mr. W. Wilson. 



