embryophyte


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embryophyte

any plant of the nontaxonomic group Embryophyta, possessing an embryo and multicellular sex organs. Examples include mosses, liverworts, ferns and seed plants.
References in periodicals archive ?
Coleochaete and embryophytes retain their zygotes on the maternal gametophyte, whereas Chaetosphaeridium expels its ova before fertilization.
This implies that interpolation of a multicellular diploid phase, between syngamy and meiosis, evolved after the divergence of stoneworts and embryophytes.
In summary, the last common ancestor of stoneworts and embryophytes can tentatively be proposed to have possessed a multicellular, oogamous, haploid gametophyte that did not produce zoospores (absent in Chara and embryophytes, present in Coleochaete).
For purposes of further discussion I will assume that Remy's reconstruction of the 'rhyniophyte' life cycle is correct, as are modern phylogenetic reconstructions in which embryophytes and tracheophytes are monophyletic, but 'bryophytes' are paraphyletic.
The dispersed-zygote hypothesis includes all scenarios in which modem embryophytes descended from ancestors with free-living haploid and diploid phases, linked by two dispersal stages (zygote and spore).
The key feature that distinguishes these hypotheses is whether embryophytes had an ancestor with zygotic dispersal, not whether gametophytes and sporophytes were ever 'isomorphic'.
lutein, beta-carotene) with embryophytes and, associatedly, similar chloroplast structure and thylakoid arrangement (Van den Hock et al.
Regardless, the Viridiplantae are considered by virtually all authors to represent generally related groups of organisms, some details not withstanding; in most cladistic analyses it seems clear that, among algae, charophytes place the closet to lower embryophytes.
The selection of the flattened-spheroidal, sometimes parenchymatous Coleochaetae as possibly representative of the putative ancestor of embryophytes (particularly thallose liverworts) is not a new idea and was clearly suggested by Bower (1908) and later supported by Campbell (1940).
to embryophytes), as discussed throughout this article, the focus need now be primarily on those groups of algae clearly related to embryophytes (in attempting to account for land-plant origins).
Bower, 1908) as being similar to thalli of simple embryophytes (e.
If it is convincing that Coleoehaete is similar to the algal ancestor of primitive embryophytes (cf.