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Index Horneophytopsida

Horneophytopsida is a class of extinct plants which consisted of branched stems without leaves, true roots or vascular tissue, found from the Late Silurian to the Early Devonian (around). They are the simplest known polysporangiophytes, i.e. plants with sporophytes bearing many spore-forming organs (sporangia) on branched stems. [1]

18 relations: Aglaophyton, Caia (plant), Clade, Cladogram, Class (biology), Devonian, Horneophyton, Polysporangiophyte, Rhyniophytina, Salopella, Silurian, Sporangium, Sporophyte, Tarrantia, Tortilicaulis, Tracheid, Vascular plant, Vascular tissue.


Aglaophyton major (or more correctly Aglaophyton majus) was the sporophyte generation of a diplohaplontic, pre-vascular, axial, free-sporing land plant of the Lower Devonian (Pragian stage, around). It had anatomical features intermediate between those of the bryophytes and vascular plants or tracheophytes.

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Caia (plant)

Caia is a genus of small fossil plants of Late Silurian age (around). The diagnostic characters are naked parallel-sided axes branching isotomously, terminating in vertically elongate sporangia (spore-forming organs) which bear spinous emergences particularly at the distal ends.

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A clade (from κλάδος, klados, "branch"), also known as monophyletic group, is a group of organisms that consists of a common ancestor and all its lineal descendants, and represents a single "branch" on the "tree of life".

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A cladogram (from Greek clados "branch" and gramma "character") is a diagram used in cladistics to show relations among organisms.

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Class (biology)

In biological classification, class (classis) is a taxonomic rank, as well as a taxonomic unit, a taxon, in that rank.

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The Devonian is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya.

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Horneophyton, a member of the Horneophytopsida, is an extinct early plant which may form a "missing link" between the hornworts and the Rhyniopsida.

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Polysporangiophytes, also called polysporangiates or formally Polysporangiophyta, are plants in which the spore-bearing generation (sporophyte) has branching stems (axes) that terminate in sporangia.

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Rhyniophytina is a subdivision of extinct early vascular plants that are considered to be similar to the genus Rhynia, found in the Early Devonian (around). Sources vary in the name and rank used for this group, some treating it as the class Rhyniopsida, others as the division Rhyniophyta.

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Salopella is a form genus for small fossil plants of Late Silurian to Early Devonian age.

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The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago (Mya), to the beginning of the Devonian Period, Mya.

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A sporangium (pl., sporangia) (modern Latin, from Greek σπόρος (sporos) ‘spore’ + αγγείον (angeion) ‘vessel’) is an enclosure in which spores are formed.

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A sporophyte is the diploid multicellular stage in the life cycle of a plant or alga.

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Tarrantia is a form genus of small fossil plants of Early Devonian age.

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Tortilicaulis is a moss-like plant known from fossils recovered from southern Britain, spanning the Silurian-Devonian boundary (around). Originally recovered from the Downtonian of the Welsh borderlands, Tortilicaulis has since been recovered in the famous Ludlow Lane locality.

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Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts.

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Vascular plant

Vascular plants (from Latin vasculum: duct), also known as tracheophytes (from the equivalent Greek term trachea) and also higher plants, form a large group of plants (c. 308,312 accepted known species) that are defined as those land plants that have lignified tissues (the xylem) for conducting water and minerals throughout the plant.

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Vascular tissue

Vascular tissue is a complex conducting tissue, formed of more than one cell type, found in vascular plants.

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[1] https://en.wikipedia.org/wiki/Horneophytopsida

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