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Fronds free floating on or just below water surface, green on upper surface, transparent green on lower surface, ovoid, 0.4-0.8 mm, 1.3-2 × as long as wide, 1-1.5 × as deep as wide, rounded or slightly pointed at apex; papillae absent. Turions sometimes present, whitish green, globose, 0.2-0.8 mm. Fl. (very rare) Jun-Sep. 2n = 16, 23, 30, 40*, 46, 50, 60.
Probably perennial. Fronds floating at or just below the surface of the water, ellipsoid, with greatest width slightly below the surface of the water, 0.4-0.8 mm long, 0.3-0.5 mm wide, 1.3-2 times as long as wide, 1-1.5 times as deep as wide, rather pale and translucent-green at the surface, with 1-10(-15) stomata. Seeds unknown.
Fronds ovoid, 0.4--0.8 mm (x 0.3--0.5 mm), 1.3--2 times as long as wide, 1--1.5 times as deep as wide, rounded or slightly pointed at apex, papilla absent; adaxial surface transparently green, with 1--10(--30) stomates; pigment cells absent in vegetative tissue. 2n = 30, 60.
A very small herb. It floats on water. The fronds are free floating. They are green on the upper surface and transparent green underneath. The plant body is 0.6 mm long. It is one of the smallest flowering plants of the world.
