Rhizome short, creeping or erect, covered in scales. Stipe slender, scaly (at least at base). Lamina delicate, many times pinnately lobed or pinnate; rachises slender. Sori centred on veins, usually one to each ultimate lobe (fewer in smaller segments); indusium inflated at base, round to ovate, only covering sori when sporangia are very young, opening towards margin.
About 18 species, mainly tropical to subtropical; only 1 in Australia.