The Saint Helena Tree Fern (Dicksonia arborescens) is a characteristic plant of the "tree fern thicket" vegetation of the highest parts of the central ridge of the island of Saint Helena. It is the type species of the genus Dicksonia. It is important as a major component of a vegetation type that is one of the last remnants of the native vegetation. Many of the other endemic plants of this vegetation germinate as seedlings on the trunks of the tree fern, which thus acts as a nursery for the native flora.