hornwort


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hornwort

[′hȯrn‚wȯrt]
(botany)
References in periodicals archive ?
hornworts share a common ancestor with tracheophytes, mosses form a sister group to this combined lineage, and liverworts mark the transition to land, .
For a historical perspective, Bold and coauthors (1980) employed the division names Hepatophyta, Anthocerotophyta, and Bryophyta for the liverworts, hornworts, and mosses, respectively.
This microtubule system resembles the AMS described in meiosis of hornworts in that it is oriented parallel to the long axis of the plastids (Figs.
The Hornworts (Anthocerophytina) are a small (about 500 species in 12 genera) but evolutionarily important group as the most current phylogenies find them to be the closest extant relatives of the tracheophytes (Carafa et al.
Sporophytes of bryophytes (liverworts, hornworts, mosses) are at least partially dependent upon gametophytes for nutrition in the life cycle; that is, total sporophyte independency is not attained in the Bryophyta (s.
1998) considered liverworts to have preceded hornworts in evolution; others (e.
Goffinet & Shaw, 2009), we believe the classification of Crum and Anderson (1981) of the bryophytes as a single Division with three subdivisions--liverworts (Marchantiophytina), mosses (Bryophytina), and hornworts (Anthocerophytina)--best reflects the overall relationships of monosporangiates.
Because hornworts have wall xylans, stomates, and a well-differentiated sporophyte meristem similar to those of tracheophytes, there is reason to suspect they are closer to the tracheophytes.
The other major division, Bryophyta, comprises liverworts, hornworts, and true mosses.
Unlike hornworts and liverworts, the sporophyte grows to maximum height before sporogenesis occurs.
The deepest dichotomy in the embryophyte clade appears to separate liverworts from other embryophytes, with hornworts the sister group of tracheophytes (Samigullin et al.
The hypothesis also requires that the dependent, monosporangiate sporophytes of liverworts, mosses, and hornworts have evolved independently in the three lineages.