Wistman's Wood is one of the old sessile oak woods which contribute to the listing of Dartmoor as a SAC and is possibly a surviving fragment from the earliest Neolithic woodland clearances. It is home to exceptional epiphytic mosses, liverworts and lichens. Nearly 50 species of moss and liverwort are found in the wood along with 120 types of lichen, including Smith's horsehair lichen, speckled sea-storm lichen and pendulous wing-moss. Over 60 species of lichens grow on the exposed surfaces of the granite tors, including granite-speck rim-lichen, purple rock lichen, brown cobblestone lichen and goldspot lichen and many rare lichen grow on rocks exposed by mining which are rich in heavy metals. On the upland heaths heather (ling) and bell heather are common along with western gorse. In dry grassy areas tormentil, heath bedstraw and heath milkwort are all common. Cross-leaved heath and purple moor grass grow in wetter spots and in the boggy areas many different species of sphagnum and other mosses can be found along with liverworts, Hare's-tail Cotton-grass, round-leaved sundew and bog asphodel and in the valley bottoms, many different sedges, bogbean and pale butterwort all grow.