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Asterella Gracilis
''Asterella gracilis'' is a thallose Thallus (plural: thalli), from Latinized Greek (), meaning "a green shoot" or "twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. Many of these organisms were ... liverwort in the family Aytoniaceae. Description ''Asterella gracilis'' has a rigid, dark or light green thallose gametophyte, which can be purple-ish on the margins. The gametophyte is typically 1-2cm long and forked, with the lobes being equal to or less than 1cm long. The upper surface is somewhat bulging, with complex pores and one layer of elongated air chambers; the thallus is thicker in the center. The abaxial surface is purple-ish to black, with scales forming a row on either side of the thickened center. The thickened portion of the thallus has numerous pegged rhizoids. Paroicous, meaning the male and female reproductive organs are beside or near to each other. The archegonial recept ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thallose
Thallus (plural: thalli), from Latinized Greek (), meaning "a green shoot" or "twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. Many of these organisms were previously known as the thallophytes, a polyphyletic group of distantly related organisms. An organism or structure resembling a thallus is called thalloid, thallodal, thalliform, thalline, or thallose. A thallus usually names the entire body of a multicellular non-moving organism in which there is no organization of the tissues into organs. Even though thalli do not have organized and distinct parts (leaves, roots, and stems) as do the vascular plants, they may have analogous structures that resemble their vascular "equivalents". The analogous structures have similar function or macroscopic structure, but different microscopic structure; for example, no thallus has vascular tissue. In exceptional cases such as the Lemnoideae, where t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liverwort
The Marchantiophyta () are a division of non-vascular land plants commonly referred to as hepatics or liverworts. Like mosses and hornworts, they have a gametophyte-dominant life cycle, in which cells of the plant carry only a single set of genetic information. It is estimated that there are about 9000 species of liverworts. Some of the more familiar species grow as a flattened leafless thallus, but most species are leafy with a form very much like a flattened moss. Leafy species can be distinguished from the apparently similar mosses on the basis of a number of features, including their single-celled rhizoids. Leafy liverworts also differ from most (but not all) mosses in that their leaves never have a costa (present in many mosses) and may bear marginal cilia (very rare in mosses). Other differences are not universal for all mosses and liverworts, but the occurrence of leaves arranged in three ranks, the presence of deep lobes or segmented leaves, or a lack of clearly diff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aytoniaceae
Aytoniaceae is a family of liverworts in the order Marchantiales. Genera * ''Asterella'' Palisot De Beauvisage 1805 non Saccardo 1891 non Hara 1936 non Sollas 1886 * '' Cryptomitrium'' Austin ex Underwood 1884 * ''Mannia'' Corda 1829 * '' Plagiochasma'' Lehmann & Lindenberg 1832 nom. cons. non Pomel 1883 * ''Reboulia ''Reboulia hemisphaerica'', the hemisphaeric liverwort or small mushroom-headed liverwort, is the only species of liverwort in the genus ''Reboulia''. A possible second species ''Reboulia queenslandica'' (Stephani) M. Hicks was published in 1992 ...'' Raddi 1818 nom. cons. References External links Liverwort families {{Bryophyte-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
