significance of thallus size for the water economy of the cyanobacterial old-forest lichen Degelia plumbea

Rosette-formed, circular thalli of Degelia plumbea were studied in the laboratory. Regardless of thallus size, the optimal quantum yield of photosystem II ($F_{\text{V}}/F_{\text{M}}$) remained at a high, constant level during a drying cycle starting with fully hydrated thalli until the thallus wate...

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