Fig. 7.

Reversible light-induced changes of the yield of chlorophyll fluorescence (A, B) and of absorption at 950 nm (C) and 802 nm (D) of desiccated thalli of Rhytidium rugosum: (A) dark-adapted thalli, slowly desiccated in darkness; (B–D), light-adapted thalli, slowly desiccated under illumination. Fluorescence changes in A and B are shown as percentages with respect to the total fluorescence yield of desiccated thalli. Start and termination of illumination with photosynthetically active photon flux density 10,000 μmol m⁻² s⁻¹ is shown by arrows.