THE ONE-SIDED FILMY FERN 
395 
the tiles on a house, and the frond has, consequently, a more 
compact appearance from the greater crowding of its pinnae 
and pinnules than is the case in Unilaterale. 
Distribution. — So far as botanical researches have been 
made, the range of this Fern abroad is, as we have seen, co- 
extensive with that of Tunbridgense. In England the present 
species is found in the following counties : — In Cornwall near 
Bodmin, on the Rough Tor near Camelford, at Carn Brea in 
the vicinity of Redruth, and on Granite Tor. In Cumber- 
land, at Borrowdale, at Bow Fell, at Scale Force near 
Buttermere, at Dalegarth, at Ennerdale, at Gatesgarth Dale, 
at High Still, at Honister Crag, at Keswick, and at Lodore 
Fall. In Devon in Bickleigh Wood, on Great Mist Tor, 
Longaford Tor, Sheeps Tor, White Tor, and Vixen Tor, at 
Moreton, and in Wistman’s Wood, Dartmoor; at Shaugli 
Bridge, and along the West Lyn. In Kent. In Lancaster, 
at Tlievilly near Burnley, near Bury, and in some caves at 
Greenfield; also near the town of Lancaster. In Northum- 
berland at Jurionside. In Shropshire, in Treflack Wood 
near Oswestry. In Staffordshire, at Gradbitcli near Flash. 
In Westmoreland at Ambleside, at Langdale Pikes, at Patter- 
dale and at Stock Gill Force. In York near Lower Harro- 
gate, at Hawl Gill near Mickleton, and at Turner’s Clough, 
Rushworth. In AYales it occurs amongst the mountains of 
Brecknockshire. In Carmarthenshire. In Carnarvonshire 
at the following places : — F alls of the Llugwy, Capel Curig 
near Llanberis, Rhaiadr Mawr, Rhaiadr-y-Wenol, and Cwm 
Idwal, as well as generally through the Snowdon district. In 
Cardiganshire at the Devil’s Bridge, at Hafod, and at Pont 
Bren. In Glamorganshire growing under the Melincourt 
Waterfall, and upon some rocks near Scudeinon-Gam. In 
Merionethshire at Dolgelly, at Festiniog, at Rhaiadr-y- 
Mawddach near Llanetyd, and at Rhaiadr-Du near Maent- 
wrog. In Scotland it is found in Argyleshire at the following 
