prothallus

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prothallus

a small thalloid structure produced by the germination of the spore in ferns and related plants, which bears the ARCHEGONIA and ANTHERIDIA and is the GAMETOPHYTE generation.
References in periodicals archive ?
Analysis of expressed sequence tags in prothallia of Adiantum capillus-veneris.
gibbum (Lab.) Mett., young prothallia are glabrous, with the hairs developing only when they are mature.