LOCAL DISTRIBUTION OF FERNS. 
247 
Severn. Warwickshire, Gloucestershire, Worcester- 
shire, Staffordshire, Shropshire. 
South Wales. Glamorganshire, Carmarthenshire, 
Pembrokeshire. 
North Wales. Anglesea, Denbighshire, Bangor, Car- 
narvonshire. 
Trent. Leicestershire, Derbyshire, Nottinghamshire. 
Mersey. Cheshire, Lancashire. 
Humber. Arnecliffe and elsewhere, Yorkshire. 
Tyne. Hawthorne Dene, Durham. Morpeth, Nor- 
thumberland. 
Lakes. Cumberland, Westmoreland. 
West Lowlands. Renfrewshire, Lanarkshire. 
East Lowlands. Berwickshire, Edinburghshire. 
West Highlands. Campbelton, Argyleshire. Islay, 
Arran. 
Very frequent in Ireland and in Jersey. 
EQUISETUM TRACHYODON. 
East Highlands. Den of Airly, Forfarshire. Banks 
of the Dee, Aberdeenshire. 
Ulster. Colin Glen, Belfast; Calton Glen, Antrim. 
Ballyharrigan Glen, Londonderry. 
EQUISETUM UMBROSUM. 
Humber. Yorkshire. 
Tyne. Wynch Bridge, Teesdale, Durham. Warkworth, 
Northumberland. 
Lakes. Westmoreland. 
