(botany) The thallose liverworts, an order of the class Marchantiopsida having a flat body composed of several distinct tissue layers, smooth-walled and tuberculate-walled rhizoids, and male and female sex organs borne on stalks on separate plants.
Marchantiales
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(mär′shan·tē′ā·lēz)
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An order of the liverwort subclass Marchantiidae. Characteristic features include the differentiation of upper and lower tissues of the gametophyte, ventral scales, and rhizoids of two kinds. The sporophyte is considerably reduced, and the capsule dehisces irregularly. The archegonia, though dorsal, come to be pendant from an elevated receptacle because of differential growth resulting in decurved margins. The stalks of the receptacles are modified branches often with rhizoids in one, two, or rarely four furrows along their length. The order consists of 12 families grouped in two suborders, the more complex Marchantiineae and the simplified Ricciineae. See also Bryophyta; Marchantiidae.
| WordNet: Marchantiales |
Note: click on a word meaning below to see its connections and related words.
The noun has one meaning:
Meaning #1:
liverworts with gametophyte differentiated internally
Synonym: order Marchantiales
| Wikipedia: Marchantiales |
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 Lunularia cruciata - a thallose liverwort
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Aytoniaceae |
Marchantiales is an order of thallose liverworts that includes species like
As in other bryophytes, the gametophyte generation is dominant, with the sporophyte existing as a short-lived part of the life cycle, dependent upon the gametophyte.
The genus Marchantia is often used to typify the order, although there are also many species of Asterella and species of the genus Riccia are more numerous. The majority of genera are characterized by the presence of (a) special stalked vertical branches called archegoniophores or carocephala, and (b) sterile cells celled elaters inside the sporangium.
Families in Marchantiales
- Aytoniaceae
- Cleveaceae
- Conocephalaceae
- Corsiniaceae
- Cyathodiaceae
- Exormothecaceae
Lunulariaceae - Marchantiaceae
- Monocarpaceae
- Monosoleniaceae
- Oxymitraceae
- Ricciaceae
- Targioniaceae
- Wiesnerellaceae
Cross section through a marchantialian thallus.
References
- Crandall-Stotler, Barbara J. & Stotler, Raymond E. "Morphology and classification of the Marchantiophyta". page 63 in A. Jonathan Shaw & Bernard Goffinet (Eds.), Bryophyte Biology. (Cambridge: Cambridge University Press:2000). ISBN 0-521-66097-1.
- Grolle, Riclef (1983). "Nomina generica Hepaticarum; references, types and synonymies". Acta Botanica Fennica 121, 1-62.
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