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Epifluorescence microscopy images of thin sections of C. gyrosa lichen thalli before (A), and after exposure to niche-led conditions (B), and to full UV radiation (C,D). Red color represents chlorophyll autofluorescence from algal cells (white arrows). In samples fully exposed to UV radiation (C,D), almost no autofluorescence was observed in zones occupied by algal clusters (black arrows).
