Summary
Lichen fungi farm algae as a source of food. Many of these fungi cultivate Trebouxia as food cells by providing them with nutrients by means of haustoria. Trebouxia lives as a heterotroph inside a lichen thallus and is so dependent on the mycobiont that it cannot live independently- free-living Trebouxia do not exist. Most of the compounds produced photosynthetically by the photobiont are transported to the mycobiont where they are converted to products that are specific to the fungus.
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Ahmadjian, V. (2001). Trebouxia: Reflections on a Perplexing and Controversial Lichen Photobiont. In: Seckbach, J. (eds) Symbiosis. Cellular Origin, Life in Extreme Habitats and Astrobiology, vol 4. Springer, Dordrecht. https://doi.org/10.1007/0-306-48173-1_23
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DOI: https://doi.org/10.1007/0-306-48173-1_23
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