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The buoyancy of fruits (nutlets in utricles) of the marsh-inhabiting True Fox Sedge (Carex vulpina) was tested experimentally in stagnant water. Only 16 % of the seeds had sunk when the experiment was terminated after 284 days. Seeds did not germinate while floating, but remained fully viable (average 76 % germination for both floating and sunken seeds). For comparison, fruits of the grassland spe