prothallus

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A prothallium, or prothallus; from Latin pro = forwards and Greek θαλλος (thallos) = twig; is usually a pteridophyte, i.e. spore-bearing plant, (almost exclusively ferns) in gametophyte stage in the alternation of generations cycle. Occasionally the term is also used to describe the young gametophyte of a liverwort or peat moss as well
The minute primary growth from the spore of ferns and other Pteridophyta, which bears the true sexual organs; the oöphoric generation of ferns, etc
prothallus

    Heceleme

    pro·thal·lus

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    prōthälıs

    Telaffuz

    /ˌprōˈᴛʜaləs/ /ˌproʊˈθæləs/