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Plants small, herbaceous, in shallow water or on shores of lakes and ponds. Rhizomes slender and creeping with a siphonostele, covered with short side-attached hairs or glabrous. Fronds linear or with 2-4 obtriangular or fan-shaped pinnae attached at top of stipe, these floating on water surface or emergent. Spores formed inside bean-shaped sporocarps attached to stipe by a short peduncle. Sporocarps containing 2-30 sori, each sorus including both megasporangia and microsporangia. Megasporangium with 1 large spore; microsporangium with 16-64 small spores.
Small aquatic subaquatic or palustral annual or perennial ferns forming spreading clumps. Rhizome short-to long-creeping, slender, much-branched, bearing scales. Sterile fronds with 2 or 4 apical leaflets or leafless and consisting of the stipe only; leaflets, when present, spreading in opposite pairs. Sori borne within sporocarps, indusiate; sporocarps sessile or stalked, solitary or in groups at or near the base of the stipe; megasporangia (containing megaspores) and microsporangia (containing microspores) in the same sorus. Spores lacking chlorophyll.
Herbs growing in water or wet places, with wide–creeping solenostelic, sometimes hairy rhizomes
Small aquatic or semi-aquatic ferns with a creeping, branched, solenostelic rhizome
