Rhizome creeping, coarse, covered in hairs. Lamina harsh, pinnate, with ultimate segments c. 2 mm broad, dark green. Rachises grooved; veins in pinnules free below the sori. Sori linear, marginal; sporangia borne on continuous submarginal vein, protected by inner membranous indusium (sometimes much reduced) and recurved lamina margin; spores tetrahedral.
About 6 species, cosmopolitan; 3 occurring in Australia, 1 in Victoria.