Penn's Rocks
Penn's Rocks is a biological Site of Special Scientific Interest north of Crowborough in East Sussex. 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", "Saccogyna viticulosa" and "Harpanthus scutatus". This site is in four separate areas. A footpath runs through one of them but the others are private land.