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Isoetids are small, submerged vascular plants that often dominate the vegetation of soft-water lakes. The isoetids have short stiff leaves and large roots that might make up more than 50% of plant biomass. Leaves and roots have a system of internal gas spaces that allow efficient intra-plant gas transport and are the morphological basis for the remarkable use of sediment CO 2 in photosynthesis...
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