Rhacophytales

Rhacophytales
Rhacophyton sp.
Scientific classification
Kingdom:
Plantae
Division:
Pteridophyta
Order:
†Rhacophytales
Genera

†Chlidanophyton
†Ellesmeris
†Eocladoxylon
†Protocephalopteris
†Protopteridophyton
†Rhacophyton

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.

References

Thomas N. Taylor, Edith L. Taylor, Michael Krings: Paleobotany. The Biology and Evolution of Fossil Plants . Second Edition, Academic Press 2009, ISBN 978-0-12-373972-8, p. 401-405.


Stub icon

This fern-related article is a stub. You can help Wikipedia by expanding it.

Stub icon

This article related to a Devonian plant is a stub. You can help Wikipedia by expanding it.

Read other articles:

DuPont

Untuk pendahulunya, lihat DuPont (1802–2017). Untuk yang dipisahkan pada tahun 2019, lihat Dow Inc. dan Corteva. DuPont de Nemours, Inc.JenisPublikKode emitenNYSE: DDKomponen S&P 100Komponen S&P 500ISINUS26614N1028IndustriBahan kimiaPendahuluDow ChemicalE. I. du Pont de Nemours and CompanyDidirikan1 September 2017; 6 tahun lalu (2017-09-01)KantorpusatWilmington, Delaware, Amerika SerikatWilayah operasiSeluruh duniaTokohkunciEdward D. Breen(Chairman Eksekutif & CEO)Pendapata...

 

The Emory Wheel

The Emory WheelTypeStudent newspaperFormatBroadsheetOwner(s)Independently financed and operatedEditor-in-chiefMadi Olivier and Sophia PeyserFounded1919HeadquartersAtlanta, GeorgiaUSAWebsitewww.emorywheel.com The Emory Wheel is the independent, student-run newspaper at Emory University in Atlanta, Georgia. The Wheel is published every other week on Wednesday during the regular school year, and is updated daily on its website. The sections of the Wheel include News, Opinion, Sports, Arts & ...

 

Teleskop Luar Angkasa Hubble

Teleskop Luar Angkasa HubbleTeleskop Hubble dilihat dari Pesawat Ulang Alik Atlantis ketika Misi Servis 4 (STS-125) tahun 2009, misi yang kelima dan terakhirJenis misiAstronomiOperatorNASA · ESA · STScICOSPAR ID1990-037BSATCAT no.20580Situs webnasa.gov/hubble hubblesite.org spacetelescope.orgDurasi misiBerlalu sejak: 33 tahun, 11 bulan, 6 hari Properti wahanaProdusenLockheed (wahana antariksa) Perkin-Elmer (optik)Massa luncur11.110 kg (24.490 ...

Marat (Puy-de-Dôme)

Cet article est une ébauche concernant une commune du Puy-de-Dôme. Vous pouvez partager vos connaissances en l’améliorant (comment ?). Le bandeau {{ébauche}} peut être enlevé et l’article évalué comme étant au stade « Bon début » quand il comporte assez de renseignements encyclopédiques concernant la commune. Si vous avez un doute, l’atelier de lecture du projet Communes de France est à votre disposition pour vous aider. Consultez également la page d’aid...

 

Makeyev Rocket Design Bureau

Russian missile design company 55°06′43″N 60°08′24″E / 55.112°N 60.140°E / 55.112; 60.140 Makeyev Rocket Design BureauCompany typeJoint-stock company[when?]IndustryArms industryAerospace industrySpace industryFounded1947HeadquartersMiass, RussiaProductsBallistic missiles, Submarine-launched ballistic missiles, Launch vehiclesParentRoscosmos[1]Websitemakeyev.ru The JSC Makeyev Design Bureau (Russian: ГРЦ Макеева; also known as Makey...

 

Terrorist and Disruptive Activities (Prevention) Act

Repealed Indian legislation (1985–1995) Terrorist and Disruptive Activities (Prevention) ActParliament of India Long title An Act to make special provisions for the prevention of, and for coping with, terrorist and disruptive activities and for matters connected therewith or incidental thereto. Citation[1]Territorial extentIndiaEnacted byParliament of IndiaAssented to3 September 1987Commenced24 May 1987Amended byAct 16 of 1989, Act 43 of 1993Status: Repealed Terrorist and Disrupti...

Ariperto II

Questa voce o sezione sull'argomento sovrani è priva o carente di note e riferimenti bibliografici puntuali. Sebbene vi siano una bibliografia e/o dei collegamenti esterni, manca la contestualizzazione delle fonti con note a piè di pagina o altri riferimenti precisi che indichino puntualmente la provenienza delle informazioni. Puoi migliorare questa voce citando le fonti più precisamente. Segui i suggerimenti del progetto di riferimento. Ariperto IITremisse di Ariperto IIRe dei Longo...

 

Indonesia pada Pesta Olahraga Asia 1962

Indonesia padaPesta Olahraga Asia 1962Kode IOCINAKONKomite Olimpiade IndonesiaSitus webnocindonesia.idPenampilan pada Pesta Olahraga Asia 1962 di Jakarta, IndonesiaMedaliPeringkat ke-2 11 12 28 Total 51 Penampilan pada Pesta Olahraga Asia (ringkasan)195119541958196219661970197419781982198619901994199820022006201020142018 Indonesia berpartisipasi dalam Pesta Olahraga Asia 1962 yang diadakan di Jakarta, Indonesia dari 24 Agustus 1962 hingga 4 September 1962. Indonesia menempati peringkat kedua ...

 

Federico Ernesto di Lippe-Alverdissen

Questa voce o sezione sull'argomento nobili non cita le fonti necessarie o quelle presenti sono insufficienti. Puoi migliorare questa voce aggiungendo citazioni da fonti attendibili secondo le linee guida sull'uso delle fonti. Questa voce sull'argomento nobili è solo un abbozzo. Contribuisci a migliorarla secondo le convenzioni di Wikipedia. Federico ErnestoConte di Lippe-AlverdissenStemma In carica27 novembre 1723 –1749 PredecessoreFilippo Ernesto I SuccessoreFilippo Ernes...

Brian Shaw (basketball)

American basketball player and coach Brian ShawShaw with the Los Angeles Lakers in 2010Los Angeles ClippersPositionAssistant coachLeagueNBAPersonal informationBorn (1966-03-22) March 22, 1966 (age 58)Oakland, California, U.S.Listed height6 ft 6 in (1.98 m)Listed weight200 lb (91 kg)Career informationHigh schoolBishop O'Dowd(Oakland, California)College Saint Mary's (1983–1985) UC Santa Barbara (1986–1988) NBA draft1988: 1st round, 24th overall pickSelected by ...

 

内华达州

内華達州 美國联邦州State of Nevada 州旗州徽綽號：產銀之州、起戰之州地图中高亮部分为内華達州坐标：35°N－42°N, 114°W－120°W国家 美國建州前內華達领地加入聯邦1864年10月31日（第36个加入联邦）首府卡森城最大城市拉斯维加斯政府 • 州长（英语：List of Governors of {{{Name}}}]]） • 副州长（英语：List of lieutenant governors of {{{Name}}}]]）喬·隆巴爾多（R斯塔...

 

Северный морской котик

Северный морской котик Самец Научная классификация Домен:ЭукариотыЦарство:ЖивотныеПодцарство:ЭуметазоиБез ранга:Двусторонне-симметричныеБез ранга:ВторичноротыеТип:ХордовыеПодтип:ПозвоночныеИнфратип:ЧелюстноротыеНадкласс:ЧетвероногиеКлада:АмниотыКлада:Синапси...

Musée archéologique de Delphes

Musée archéologique de DelphesEntrée du musée de Delphes.Informations généralesType Musée archéologiqueOuverture 1903Surface 2 270 m2Visiteurs par an 275 993 (2019)[1]Site web Musée, ministère grec de la CultureCollectionsCollections Antiquités grecquesLocalisationPays GrèceCommune DelphesAdresse Τ.Κ. 33054 DelphesCoordonnées 38° 28′ 49″ N, 22° 29′ 59″ Emodifier - modifier le code - modifier Wikidata Le musée archéologiqu...

 

Whitney Young

American civil rights leader Whitney YoungYoung in 1964Executive Director of the National Urban LeagueIn office1961–1971Preceded byLester GrangerSucceeded byVernon Jordan Personal detailsBornWhitney Moore Young Jr.(1921-07-31)July 31, 1921Shelby County, Kentucky, U.S.DiedMarch 11, 1971(1971-03-11) (aged 49)Lagos, NigeriaSpouse Margaret Buckner ​(m. 1944)​Children2EducationKentucky State University (BS)Massachusetts Institute of TechnologyUniversity of Minne...

 

Palazzo Acconci

Nel seguente testo sull'argomento architettura è presente una sospetta violazione di copyright. Motivo: Come da discussione, sospetto copyviol da fonte cartacea non identificata. Da verificare l'accuratezza delle informazioni inserite da un ip. È sconsigliato wikificare o ampliare il testo attuale, che potrebbe essere cancellato. Puoi invece riformulare il testo con parole tue o partecipare alla discussione. Segui i suggerimenti del progetto di riferimento.Avvisa l'autore: {{Avvisocon...

لغتان وحقيبة سفر (فيلم)

هذه المقالة يتيمة إذ تصل إليها مقالات أخرى قليلة جدًا. فضلًا، ساعد بإضافة وصلة إليها في مقالات متعلقة بها. (أغسطس 2023) لغتان وحقيبة سفرİki Dil Bir Bavul (بالتركية) معلومات عامةالصنف الفني دراماتاريخ الصدور25 نوفمبر 2008 (2008-11-25) (مهرجان امستيردام العالمى للافلام الوثائقية)23...

 

Kingstown

Capital and chief port of Saint Vincent and the Grenadines For other uses, see Kingstown (disambiguation). Not to be confused with Kingston, Jamaica. Town and Capital in Saint Vincent, Saint Vincent and the GrenadinesKingstownTown and Capital Top:Aerial view of Kingstown; Middle: Carnegie Old Public Library, Fort Charlotte; Bottom: St. George's Cathedral, Botanic Gardens St. VincentNickname: City Of Arches[1]KingstownLocation in Saint Vincent and the GrenadinesCoordinates: 13°09...

 

January

First month in the Julian and Gregorian calendars This article is about the month. For other uses, see January (disambiguation). Jan. redirects here. For other uses, see Jan (disambiguation). << January >> Su Mo Tu We Th Fr Sa 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31   2024 January is the first month of the year in the Julian and Gregorian calendars. Its length is 31 days. The first day of the month is known as New Year's Da...

Scott Rudin

Scott Rudin nel 2008 con l'Oscar vinto per il film Non è un paese per vecchi. Oscar al miglior film 2008 Scott Rudin (Baldwin, 14 luglio 1958) è un produttore cinematografico e teatrale statunitense. Rudin è il primo e unico produttore ad aver ottenuto l'EGOT, la vittoria dei quattro maggiori premi dello show-business statunitense: l'Emmy, il Grammy, l'Oscar ed il Tony Award.[1] Indice 1 Biografia 2 Vita privata 3 Filmografia 3.1 Produttore 3.2 Produttore esecutivo 4 Teatro (parzia...

 

Workflow

Pattern of activity often with a result Cryogenic electron microscopy workflow An IMRAD model for developing research articles Workflow is a generic term for orchestrated and repeatable patterns of activity, enabled by the systematic organization of resources into processes that transform materials, provide services, or process information.[1] It can be depicted as a sequence of operations, the work of a person or group,[2] the work of an organization of staff, or one or more ...