 Hymenophyllaceae

The Hymenophyllaceae (filmy ferns and bristle ferns) are a family of two to nine genera (depending on classification system) and ca 650 known species of ferns, with a subcosmopolitan distribution, but generally restricted to very damp places or to locations where they are wetted by spray from waterfalls or springs.A recent fossil find shows that ferns of Hymenophyllaceae have existed since at least the Upper Triassic.