Aquatic herb; corm 2-lobed, centrally constricted, 5–15 mm long. Leaves to 15, distichous, erect, 1–4 (–8) cm long, 1–2 mm diam., firm, tapering to an acute apex, mid-green; base to 8 mm wide, narrowly winged, white; peripheral fibre strands, stomata and internal hairs absent; trans-lacunar diaphragms visible especially basally; ligule reniform, 1 mm long; labium absent. Sporangia round, 1–3 mm diam., semi-translucent, white; velum absent. Microspores spinulose or with cylindrical projections surmounted by finger-like branches, brown. Megaspores Type I, spherical, 0.3–0.5 mm diam., almost smooth or finely tuberculate, drying white to black.
Widespread on granite outcrops, where it occurs in ephemeral pools. Often found growing with Glossostigma spp., Isoetes brevicula or I. caroli .Widespread on granite outcrops, where it occurs in ephemeral pools. Often found growing with Glossostigma spp., I. brevicula or I. caroli .
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