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We grew the amphibious liverwort, Riccia fluitans, at saturating nitrogen and phosphorus concentrations in a cross-factorial design under three levels of light and three levels of CO2 making a matrix of nine treatments. Under these conditions, the relative growth rate (RGR) ranged from 0.011 d−1 at low light and CO2 availability to 0.138 d−1 at high light and CO2 with a significant positive interaction...
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