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 ?
the prothalli were unisexual, and they maintained so throughout the observational period.
The development of apparently strict unisexual prothalli suggests that D.
Morphology of the spores, prothalli and juvenile sporophytes of Doryopteris.
Biosynthesis of ecdysteroids in vitro prothalli cultures of Polypodium vulgare.
Young sporophytes became visible on the prothalli in A.
The prothalli produced gemmae which, when shed, develop into new prothalli.
By the eleventh week from sowing, adult cordate, hairy prothalli were found.
Eleven weeks age prothalli develop archegonia, while no antheridia are formed at all.
Morphology of the prothalli of some species of the Potypodiaceae II: Lepisorus loriformis, L.