Small epiphytic or terrestrial ferns. Rhizome long-creeping or short, often slender to filiform, sometimes thick, hairy, with or without roots. Stipe filiform or slender, frequently winged to base. Lamina simple to variously pinnate, usually 1 cell thick (except the veins), membranous, almost transparent. Pinnae glabrous or hairy; pinnules small, mostly 1-veined; veins usually free; false veins composed of rows of thickened cells may be present. Sori marginal, terminal on pinnules or on short lateral lobes; indusium bivalvate, tubular or obconic, lips often much dilated; receptacle columnar, included within indusium or long-exserted and bristle-like. Sporangia spherical to compressed, very shortly stalked or sessile, clustered around receptacle; annulus complete, oblique or almost transverse; spores 32–420 per sporangium, tetrahedral to globose. Gametophyte ribbon-like and branching, thallose or filamentous.
A family of 2-33 genera, depending on the taxonomic treatment followed; Tindale (1963) recognizes 11 genera and 44 species in Australia, all restricted to the eastern coast of Australia (not found in WA, SA or, except for one record, NT).