prothallium
Sign in to savethumb|right|Prothallus (prothallium) of the fern Polypodium vulgare seen under a light microscope.
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- Alternation of generations
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- In lichens
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thumb|right|Prothallus (prothallium) of the fern Polypodium vulgare seen under a light microscope.
A prothallus, or prothallium, (from Latin pro = forwards and Greek θαλλος (thallos) = twig) is usually the gametophyte stage in the life of a fern or other pteridophyte. Occasionally, the term is also used to describe the young gametophyte of a liverwort or peat moss as well. In lichens, it refers to the region of the thallus that is free of algae.
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photosynthesis
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algae
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moss
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egg cell
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zygote
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mitotic cell cycle
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