868 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. Rutland. 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. Fifeshire. 

 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. Si/me. Shetland. 



W. Isles. — N. Uist. Harris. Lewis. 



