Rhizome scales coarse and narrow, with fine tips, some hair-like. Fronds uniform or dimorphic, not articulated; stipe and rachises grooved on upper surface. Lamina glabrous, fan- or wedge-shaped, regular or oblique. Pinnae decurrent on raised edge of rachis; veins forking several times, midribs absent. Sori protected by narrow, outward-opening flap (margin of leaf often so delicate that sori appear to be protected by a double indusium); spores tetrahedral.
About 200 species; 14 occurring in Australia, 3 in Victoria.