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Genus :


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Species of this Genus


Small-sized, typically sub-aquatic, perennial fern allies. Rhizome creeping, hairy, growing on mud, submerged or enduring dessication. Fronds erect with circinate in vernation, spreading or floating, simple and linear or with two or four opposite leaflets at the end of long stipes. Veins promonent dichotomously branched. Sporangia enclosed in hard, bean shaped structure, borne on the stipes or their bases and constructed as fertile pinnae. Sporocarp contains two types of spores megaspores and microspores. Sorus consists of megasporangia and microsporangia, megaspore solitary and microspore many.