Terrestrial or epiphytic, moss-like fern-allies about 25-60 cm long and
about 3-5 cm wide. Rhizome erect.
Vascular bundles actinostelic or plectostelic. True stipe not present
and not visible, small crowded fronds cover all over the stipe. Fronds less developed, and spirally arranged,
vegetative or reproductive fronds similar or dis-similar, forming definite or
indefinite strobili. Sometimes fronds gradually decreasing towards the apex.
Vegetative fronds flat, or subulate, spirally arrangeed. Sporophylls sometimes
small and different from vegetative fronds. Sporangia either attached to the
spike or at the axils of sporophylls compactly arranged. Sporangia stalked or
sessile. Spore reniform, ovate to triangular.