Only a few species of lichens are green. Most are gray, less brown, yellow and orange. Why is this so, because lichens are capable of photosynthesis?
Coloring depends on the presence of pigments deposited in the shell of the fungal hyphae, especially the outer layer and part of the fruiting bodies. Sometimes the color depends on the color of lichen acids, which are deposited on the surface of the fungus hyphae. An important factor in the color of lichens belongs to light, the more of it, the brighter the color.
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