368 
HISTORY OF BRITISH FERNS. 
Thames. — Middlesex. Kent. Surrey. Hertfordshire. Ox- 
fordshire. Essex. 
Ouse. — Suffolk. Norfolk. Cambridgeshire. Bedfordshire. 
Huntingdonshire. Northamptonshire. 
Severn. — Warwickshire. Gloucestershire. Herefordshire. 
Worcestershire. Staffordshire. Shropshire. 
S. Wales. — Glamorganshire. Carmarthenshire. 
N. Wales. — Anglesea. Denbighshire. 
Trent. — Leicestershire. Kutland. Lincolnshire. Derbyshire. 
Nottinghamshire. 
Mersey. — Cheshire. Lancashire. 
Humber. — Yorkshire. 
Tyne. — Durham. Northumberland. 
Lakes.— Cumberland. Westmoreland. 
W. Lowlands. — Dumfries-shire. Kirkcudbrightshire. Renfrew- 
shire. Lanarkshire. 
E. Lowlands.^ — Roxburghshire. Berwickshire. Edinburgh- 
shire. 
E. Highlands. — Clackmannanshire. Kinross-shire. Fifeshir^. 
Perthshire. Forfarshire. Aberdeenshire. Morayshire. 
W. Highlands. — Dumbartonshire. Loch Skyros, Islay (with 
var. simplex 
N. Highlands. — Ross-shire. Caithness- shire. 
N. Isles. — Kirkwall, Orkney, J. T, Syme. Shetland. 
W. Isles. — N. Uist. Harris. Lewis. 
