The flora of the island is relatively untouched with a large number of rare plants, 44% being endemic to the island. With a diversity of conditions ranging from valleys, to ridges, plains, and misty mountain tops, habitat is available for a wide range of plant communities, which have been comprehensively analysed and mapped. Mosses include Spiridens muelleri. There are 57 species of ferns, of which 25 are endemic: they are most abundant in the moist environments of the southern island, especially the higher parts of Mount Gower, perhaps the most apparent being the four endemic tree ferns in the genus Cyathea that occur on the southern mountains.