Penn's Rocks is a biological
Site of Special Scientific Interest
A Site of Special Scientific Interest (SSSI) in Great Britain or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland is a conservation designation denoting a protected area in the United Kingdom and Isle of ...
north of
Crowborough
Crowborough is a town and civil parish in East Sussex, England, in the Weald at the edge of Ashdown Forest in the High Weald Area of Outstanding Natural Beauty, 7 miles (11 km) south-west of Royal Tunbridge Wells and 33 miles (53 ...
in
East Sussex
East Sussex is a ceremonial and non-metropolitan county in South East England on the English Channel coast. It is bordered by Kent to the north and east, West Sussex to the west, and Surrey to the north-west. The largest settlement in East Su ...
.
This site is a steep sided valley on sandstone with many mosses and
liverworts, which is a nationally rare habitat. Uncommon species include ''
Orthodontium gracile'', ''
Bazzania trilobata
''Bazzania trilobata'', the greater whipwort or threelobed bazzania, is a species of liverwort in the Lepidoziaceae family. It grows in the northern hemisphere temperate
In geography, the temperate climates of Earth occur in the middle ...
'', ''
Saccogyna viticulosa'' and ''
Harpanthus scutatus
''Harpanthus scutatus'' is a species of liverworts belonging to the family Geocalycaceae.
It is native to Eurasia and Northern America
Northern America is the northernmost subregion of North America. The boundaries may be drawn slightly ...
''.
This site is in four separate areas. A footpath runs through one of them but the others are private land.
References
{{SSSIs East Sussex
Sites of Special Scientific Interest in East Sussex
Withyham