Amphibious or semi-terrestrial herb; corm 2-or 3-lobed, to 10 mm wide. Leaves to 30, spirally arranged, erect or recurved, 3–13 (–30) cm long, 1–2 mm diam., acute, bright green; base to 20 mm wide, broadly winged, white; peripheral fibre strands 2–4, rarely with small accessory ones; stomata present distally; internal hairs absent; trans-lacunar diaphragms visible; ligule triangular-cordate, 1–2 mm long; labium small. Sporangia round to obovate or elongate-elliptic, c. 5 mm diam.; wall opaque, shiny, dark brown; velum absent. Microspores granulose, slightly papillose to tuberculate. Megaspores Type I and/or III, 0.25–0.6 mm diam.; proximal and distal faces tuberculate; tubercles often coalescing into short irregular cristae, drying white.
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