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DescriptionTerrestrial perrenial ferns with rhizomes erect or procumbent, enclosed by a mass of persistent stipe-bases and roots. Stipe winged at the base, cylindrical higher up. Fronds numerous, tufted, perennial or deciduous, 2-pinnate or deeply 2-3-pinnatifid. Sporangia large, borne either on both surfaces of narrow fertile pinnules or on the under surface of undifferentiated pinnae.