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DescriptionTerrestrial perennials. Roots borne at irregular intervals on the lower side of the main stem. Stems of two types, consisting of elongated, indeterminate main stems and determinate, lateral, branchlet systems. Sporophylls different to the leaves, ephemeral. Strobili erect, borne on simple or forked peduncles. Sporangium epidermal cells sinuate.