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DescriptionMinute, floating aquatics with thalli usually less than 1 mm. Roots 0. Thalli solitary or 2 cohering, inflated, globular; nerves 0. Budding pouch 1. Inflorescence of 1 female and 1 male flower without a membranous spathe. Anther 1-thecous. Fruit 1-seeded. Seed up to 0.5 mm, spherical, smooth and spongy.