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Rhizome  creeping or erect, terrestrial or epiphytic ferns. Stipe stout rachis grooved. Fronds simple, pinnate or more finely dissected to tri-pinnate, with free veins. In the finely disected fronds, one vein and one sorus to each lobe of its leaflets. In bipinnate fronds, sorus on each leaflet open towards the midrib. Sorus usually rather long, along and on the side of the veins, protected by narrow indusium and opening normally towards the midrib of the leaflet, in some species double sori, or sori of irregular orientation may occur. Spores monolete, usually ellipsoid, with perispore very promonent and with various type of orientation.