About: Rhacophytales

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Rhacophytales are an extinct group of plants from the Devonian period. The representatives are characterized by a unique branching system in which bi- and quadriseriate units occur which are located in the axils of special structures, the aphlebiae. These are abnormal leaflets on the rhachis of ferns. The appendages of the last branching stage can be dichotomously branched, in some forms they stand in one plane. The vascular system consists of a clepsydroid primary xylem with a cross section and a secondary xylem. The sporangia are in groups and have no annulus. All representatives must have been homosporous.

Attributes	Values
rdf:type	Thing Eukaryote Embryophyte eukaryote species yago:LivingThing100004258 yago:Object100002684 yago:Organism100004475 yago:PhysicalEntity100001930 yago:Plant100017222 fern Band plant yago:Whole100003553 yago:WikicatExtinctPlants
rdfs:label	Rhacophytales (de) Rhacophytales (en)
rdfs:comment	Die Rhacophytales sind eine ausgestorbene Pflanzengruppe aus dem Devon, die nahe der Basis der Farne steht. (de) Rhacophytales are an extinct group of plants from the Devonian period. The representatives are characterized by a unique branching system in which bi- and quadriseriate units occur which are located in the axils of special structures, the aphlebiae. These are abnormal leaflets on the rhachis of ferns. The appendages of the last branching stage can be dichotomously branched, in some forms they stand in one plane. The vascular system consists of a clepsydroid primary xylem with a cross section and a secondary xylem. The sporangia are in groups and have no annulus. All representatives must have been homosporous. (en)
foaf:depiction
dcterms:subject	Late Devonian extinctions Late Devonian plants Prehistoric plant orders Fern orders Middle Devonian first appearances Middle Devonian plants
Wikipage page ID	32670748 (xsd:integer)
Wikipage revision ID	1115929428 (xsd:integer)
Link from a Wikipage to another Wikipage	Devonian Late Devonian extinctions Late Devonian plants Prehistoric plant orders Fern orders Pteridophyta Middle Devonian first appearances Middle Devonian plants Plant Xylem dbr:Chlidanophyton dbr:Rhacophyton dbr:Ellesmeris dbr:Eocladoxylon dbr:Protocephalopteris dbr:Protopteridophyton
sameAs	Rhacophytales Rhacophytales Rhacophytales Rhacophytales Rhacophytales
dbp:wikiPageUsesTemplate	dbt:Expand_German dbt:ISBN dbt:Short_description dbt:Taxobox dbt:Taxonbar dbt:Geological_range/linked dbt:Devonian-plant-stub dbt:Fern-stub
thumbnail	wiki-commons:Special:FilePath/Rhacophyton1.jpg?width=300
image caption	Rhacophyton sp. (en)
ordo	†Rhacophytales (en)
regnum	Plantae (en)
subdivision	†Chlidanophyton (en) †Ellesmeris (en) †Eocladoxylon (en) †Protocephalopteris (en) †Protopteridophyton (en) †Rhacophyton (en)
subdivision ranks	Genera (en)
has abstract	Die Rhacophytales sind eine ausgestorbene Pflanzengruppe aus dem Devon, die nahe der Basis der Farne steht. (de) Rhacophytales are an extinct group of plants from the Devonian period. The representatives are characterized by a unique branching system in which bi- and quadriseriate units occur which are located in the axils of special structures, the aphlebiae. These are abnormal leaflets on the rhachis of ferns. The appendages of the last branching stage can be dichotomously branched, in some forms they stand in one plane. The vascular system consists of a clepsydroid primary xylem with a cross section and a secondary xylem. The sporangia are in groups and have no annulus. All representatives must have been homosporous. The exact taxonomic position of Rhacophytales is still unclear. Rhacophyton was considered to be part of Aneurophytales (a progymnosperm order) in the past, when it was regarded as a precursor of seed ferns and true ferns. It was considered to be in Protopteridales, Zygopteridales, or the basal group in Coenopteridales, an polyphyletic group containing also Stauropteridales and Zygopteridales. The representatives of the order share characteristics with some representatives of Iridopteridales and the progymnosperms. Some authors put them as a family in Zygopteridales, a fossil fern group. With them, they share glass-shaped xylem and quadriseriate branching. With the progymnosperms they share secondary xylem. Taylor, Taylor and Krings (2009) see them as more evolved than Trimerophyta from which they originated, but they lack the organ differentiation found in the somewhat younger fern-like plants. (en)
divisio	Pteridophyta
gold:hypernym	Group
prov:wasDerivedFrom	wikipedia-en:Rhacophytales?oldid=1115929428&ns=0
page length (characters) of wiki page	2581 (xsd:nonNegativeInteger)
division	Pteridophyta
kingdom	Plant
foaf:isPrimaryTopicOf	wikipedia-en:Rhacophytales
is Link from a Wikipage to another Wikipage of	2021 in paleobotany List of plant orders Fern 2016 in paleobotany
is foaf:primaryTopic of	wikipedia-en:Rhacophytales

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