180 BRITISH FERNS, 
Isles, on the summit of Langa, in Harris, at a pro- 
bable elevation of 2700 feet. On the mainland of 
it has been found in Perthshire, on Ben 
Lawers; in Argyleshire, at Dunoon; in Dum m= 
shire, on rocks on the banks of Loch Lomond; in 
: Renfrewshire, on rocks and hills above Gourock; and 
in Dumfriesshire, in Girpel Lane, Kirkpatrick Juxta. 
Descending into England, we find it in four northern 
counties: in Cumberland, at Scale Force, on the rocks 
and serees; in Scaw Fell, High Still, Honister Crag, 
Gatesgarth Dale, Borrowdale, &c.; in Westmoreland, 
at Stock Gill and Dungeon Gill; in Yorkshire, at 
Turner's Clough, seven miles from Halifax, on the 
Oldham road; on rocks near Lower Harrogate; and 
near Greenfield: in Lancashire, on the Old Man 
mountain, sparingly in caves at Greenfield, commonly 
near Lancaster, on hills near Bury, at Thevilly, near 
Burnley. Passing into Wales, it is found in five 
‘Capel Cerig, Rhayadr-Mawr, near Llanberis, &e. In 
rionethshire, I have observed Unilaterale in abund- 
at Rhayadr Du, near Maentwrog, and at Rhaidr- 
