Amphibious herb; corm 3-lobed, 7–15 mm wide. Leaves 5–15, spirally arranged, erect or recurved, 25–70 mm long, 0.5–1 mm diam., flexible, acute, bright green; base to 15 mm wide, broadly winged, white; peripheral fibre strands and internal hairs absent; stomata numerous in apical part; trans-lacunar diaphragms visible; ligule elongate-triangular, 1–1.5 mm long; labium present or absent. Sporangia elliptic to round, 3–4 mm long, c. 2 mm wide, semi-transparent, spotted dark brown, rarely uniformly brown; velum absent. Microspores scabrous, dark brown. Megaspores Type I, 0.35–0.45 mm diam.; proximal and distal faces cristate to reticulate, rarely almost smooth, drying dull brown, although white when immature.
Occurs in shallow rock pools on granite outcrops, or in seepage areas around outcrops, among mosses.
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