protonema


pro·to·ne·ma

noun \ˌprō-tə-ˈnē-mə\
plural pro·to·ne·ma·ta\-ˈnē-mə-tə, -ˈne-\

Definition of PROTONEMA

:  the primary usually filamentous thalloid stage of the gametophyte in mosses and in some liverworts comparable to the prothallus in ferns
pro·to·ne·mal \-ˈnē-məl\ adjective
pro·to·ne·ma·tal \-ˈnē-mə-təl, -ˈne-\ adjective

Origin of PROTONEMA

New Latin protonemat-, protonema, from prot- + Greek nēma thread — more at nemat-
First Known Use: 1857

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