Plant Description Notes
Plants amphibious, cormless, carpet forming, often bearing distal, adventitious plantlets. Stem prostrate, centrally-furrowed, 3-35 mm. long, 0.5 - 1.5 mm. in diameter, often curled or arching downward; roots not dichotomously forked, usually forming three linear rows along each side of the median furrow: two slender, lateral roots and one stout (often coiled), basal root associated with each leaf; leaves few (4-8), distichous, awl-shaped, 2-4 cm. long, 1 mm. broad and equitant at base; peripheral strands absent, stomata present along upper third of leaf; ligule less than 1 mm. long; megaspores few (4-20), 275-370 mu in diameter, trilete, low-tuberculate, brown; microsporangia elliptic-reniform, up to 1 mm. long; microspores numerous, 26-33 mu long, monolete, spinulose, brown.