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prothallus
(prō-thălˈəs) or pro·thal·li·um (-thălˈē-əm)
noun pl. pro·thal·li (-thălˈī) or pro·thal·li·a (-thălˈē-ə) A small, flat, delicate structure produced by a germinating spore and bearing sex organs. It is the gametophyte of ferns and some other plants.
Related Forms:
- pro·thalˈli·al (-lē-əl) adjective
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