archegonium

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Related to archegonia: megaspores

archegonium

[‚ark·ə′gōn·ē·əm]
(botany)
The multicellular female sex organ in all plants of the Embryobionta except the Pinophyta and Magnoliophyta.
References in periodicals archive ?
In most hermaphroditic gametophytes, antheridia were usually produced prior to cushion formation while the archegonia occurred only after the cushion formed.
1998) found that gametophytes grown in culture from spores of five other Elaphoglossum species only produced archegonia after 8-24 months of growth.
The main objectives were: (1) confirming the uniformity of spore germination and prothallus development among closely related species; (2) documenting the variation of the morphology of mature gametophytes; (3) determining the presence/absence of sexual organs, in particular archegonia.
In contrast, no significant differences in the number of archegonia per archegonium-bearing gametophyte were observed when corrected for thallus area, but were observed when corrected for each of the three morphological metrics (Table 5, Fig.
The cells coming to form archegonia (the initial cell, 1c) can be identified by the cylindrical shape of the cell, which possesses more cytoplasm around the central placed nucleus in contrast to the somatic cells (Fig.
Gametophytes produced antheridia, but no archegonia, similar to previous reports of Cheilanthes feei T.
These branches had antheridia and archegonia interspersed along their length and thus were sexually mature.
Besides the improper time counting the number of juvenile sporophytes and the physical structure of the mixture, a density of spores or gametophytes that was too high may have resulted in lack of nutrition, an unbalanced proportion of antheridia and archegonia or something else (Liu and Liu, 2001), though a higher density of gametophytes contributes to more antheridia and more sporophytes for some species (Raghavan, 1989; Pan et al.
Gametophytes bearing archegonia were placed in 3% glutaraldehyde in 0.
But in this case, also archegonia were formed later (218 days) than in P.
Firstly, archegonia were relatively abundant, present immediately behind the apical notch.
Spores develop into gametophytes that are either hermaphroditic, containing both archegonia and antheridia, or exclusively male, containing only antheridia (Banks, 1997).