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Changes in net photosynthesis (NP) and dark respiration (RD) as a function of thallus water content in (A) Phyllogonium viscosum (Fortuna) and (B) Symbiezidium spp. (Palo Seco). The open symbols denote NP, closed symbols are RD. The different symbol shapes refer to different samples. Dashed lines indicate zero net gas exchange.
