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STUDIES IN THE PHYSIOLOGY OF LICHENS

V. TRANSLOCATION FROM THE ALGAL LAYER TO THE MEDULLA IN PELTIGERA POLYDACTYLA

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Summary

Carbon fixed by photosynthesis in the algal layer can move into the medulla of Peltigera polydactyla within 30 minutes. This movement continues at a steady rate equivalent to 40–50% of the total rate of carbon fixation in photosynthesis, and it can also continue for a time in darkness. Fixed carbon accumulates initially as soluble compounds, especially mannitol, both in the algal layer and in the medulla. Since translocation in the thallus is relatively rapid it follows that the first stage of this process, namely, the transfer of photosynthetic products within the algal layer from an algal cell to its associated fungal hyphae, is also a rapid process.

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