WILSON'S FILMY FERN. 

 Hymen OPHYLLUM Wilsoni. — Hooker, Mackay, Francis. 



LOCALITIES. 



England . . . Cumberland ; Westmoreland, in the lake district, Scaw Fell, Scale- Force waterfall, 

 Lodore waterfall, waterfall above Ambleside, in ravines near theSkrees, on rocks 

 in Wastdale, and near Wastwater, Derwentwater, Buttermere, and Winander- 

 mere ; Yorkshire, near Halifax, Greenfield, and Saddleworth. 



Wales Caernarvonshire, throughout the Snowdon district, Rhaiadr-y-Wenol, Falls of the 



Lugwy, Capel Curig, Rhaiadr Mawr, near Llanberris, Cwm Idwel, Nant Frangon, 

 &c. &c. ; Merionethshire, at Rhaiadr Du, near Maentwrog, and Rhaiadr-y- 

 Mawddach, near Llaneltyd ; Brecknockshire, near Brecon. 



Scotland . . . Abundant in the Highlands ; the localities are far too numerous to detail. 



Ireland. . . . Counties Antrim, Londonderry, and Donegal; County Galway, at Maam, Round- 

 stone, and near Oughterard ; County Kerry, throughout the KiUarney district; 

 County Cork, GleugarrifF and Youghal ; and County Wicklow, at Glendalough, 

 the Hermitage Glen, and Powerscourt Waterfall. 



In this, as in the preceding species, I have omitted those 

 localities which I could not verify by my own observation ; the 

 present species is most abundant in Scotland, descends through 

 the northern EngUsh, Welsh, and Irish counties, and finally 

 mingles most abundantly with Tunbridgense, in the southern 

 counties of Ireland. 



The roots and rhizoma of Wilsoni ofier no characters by 

 which I can distinguish them from those of Tunbridgense ; the 

 fronds of both are circinate, they make their appearance late in 



