Osmundaceae Martinov
  • Tekhno-Bot. Slovar. 445. 1820. (3 Aug 1820)
  • Royal Fern Family


Cite taxon page as 'WFO (2022): Osmundaceae Martinov. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-7000000433. Accessed on: 15 Aug 2022'

General Information

Plants terrestrial, herbaceous, frequently in clumps. Stems creeping, beset with old petiole bases and black fibrous roots; scales absent; older stems seldom persisting. Leaves monomorphic or dimorphic. Blades 1--2-pinnate (2-pinnatifid); rachises grooved. Pinnae monomorphic or dimorphic. Indument of reddish to light brown hairs. Veins dichotomous, running to margins. Sori absent; sporangia born on slightly modified fertile segments of blades also possessing fully expanded pinnae, or sporangia covering blades lacking green expanded pinnae, clustered in marginal zones, indusia lacking. Spores green, all alike. Gametophytes green, aboveground, obcordate to elongate.

  • Provided by: [D].Flora of North America @ efloras.org
    • Source: [
    • 4
    • ]. 

    Plants terrestrial, with mostly unbranched, often massive, erect, or shortly creeping, ascending, sometimes treelike trunk clothed in roots and persistent stipes, hairy at apex. Rhizome anatomy distinctive, an ectophloic siphonostele (with a pith of parenchyma in center and phloem outside of vascular cylinder only), with a ring of discrete xylem strands, these often conduplicate or twice conduplicate in cross section. Fronds 1- or 2-pinnate, catadromous, when young bearing wool-like, uniseriate hairs, these deciduous or persistent at axes, dimorphic or with fertile portions dissimilar to sterile; stipe caespitose, spirally arranged, with laterally winged stipules at bases, bearing mucilaginous hairs when young, with a single U-shaped vascular bundle; sclerenchyma strongly developed; base of lateral pinnae nearly always distinctly articulate (but only functional in some species); pinnule base sometimes also articulate, though less distinctly so; veins free, subpinnately furcate. Sporangia not assembled in sori, following veins or entirely covering strongly contracted fertile segments, sporangia large, with 128-512 spores, opening by an apical slit, annulus lateral; spores green, subglobose, trilete; gametophytes large, green, cordate, surficial. x = 22.

  • Provided by: [C].Flora of China @ efloras.org
    • Source: [
    • 5
    • ]. 

    Morphology

    Terrestrial ferns with suberect rhizomes, clothed with persistent leaf–bases; fronds bipinnate (in W.African species), spirally arranged, when young covered with long simple hairs, base with a stipule–like flange; leaf trace crescent–shaped; sporangia with walls one cell thick borne on both surfaces of fertile pinnules in the upper part of the leaves (in W.African species) pyriform with a short stalk made up of about 5 rows of cells; annulus represented by a cluster of lateral cells with thickened walls

  • Provided by: [E].Plants Of the World Online Portal - FWTA
    • Source: [
    • 1
    • ]. 

    Terrestrial plants with erect or procumbent creeping rhizomes enclosed by a mass of persistent stipe-bases which are winged at the base

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 2
    • ]. 

    Terrestrial plants with erect or procumbent creeping rhizomes enclosed by a mass of persistent stipe-bases which are winged at the base

  • Provided by: [A].Flora Zambesiaca - descriptions
    • Source: [
    • 3
    • ]. 

    Fougères terrestres.\n\t\t\t\n\t\t\t\t Sporophytes'vivaces; rhizome dressé, entouré par la masse des bases pétiolaires persistantes.'Feuilles'à préfoliaison circinée, bi- ou tripennées, souvent recouvertes de poils simples pendant le développement, glabres à maturité.'Sporanges grands, localisés sur des divisions fertiles, non réunis en sores définis, à maturation simultanée; anneau de déhiscence apical, rudimentaire et constitué de quelques cellules épaissies.\n\t\t\t\n\t\t\t\t Spores toutes semblables, pourvues de chlorophylle.\n\t\t\tGamétophytes vivaces, épigés, cordés ou allongés, épais, vert foncé, avec une nervure centrale à la face inférieure.\n\t\t\tNombre chromosomique de base: x = 22.\n\t\t\tFamille subcosmopolite, groupant pour la plupart des auteurs trois genres,'Osmunda'L.,'Todea'Willd. et'Leptopteris'C. Presl, et une trentaine d'espèces. A. E. Bobrov [The Family'Osmundaceae , its taxonomy and geography, Bot. Journ. U.S.S.R., 52 : 1600-1610, 3 fig. (1967)] distingue en outre les genres'Osmundastrum'C. Presl et'Plenazium C. Presl, et reconnaît 36 espèces.\n\t\t\tSeul le genre'Osmunda est représenté en Afrique centrale.

  • Provided by: [F].Flore d'Afrique Centrale
    • Source: [
    • 6
    • ]. 

    Literature

    SELECTED REFERENCES

    Bobrov, A.E. 1967. The family Osmundaceae (R.Br.) Kaulf. Its taxonomy and geography. Bot. Zhurn. (Moscow & Leningrad) 52: 1600--1610. Hewitson,W. 1962. Comparative morphology of the Osmundaceae. Ann. Missouri Bot. Gard. 49: 57--93.

  • Provided by: [D].Flora of North America @ efloras.org
    • Source: [
    • 4
    • ]. 

    Other Local Names

    NameLanguageCountry
    Royal Fern Family

     Information From

    Flora Zambesiaca - descriptions
    Flora Zambesiaca
    • A
    Plants Of the World Online Portal - FTEA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • B
    Flora of China @ efloras.org
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • C Missouri Botanical Garden
    Flora of North America @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=1
    'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • D Flora of North America Association
    Plants Of the World Online Portal - FWTA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • E The Trustees of the Royal Botanic Gardens, Kew
    Flore d'Afrique Centrale
    https://www.floredafriquecentrale.be
    • F http://creativecommons.org/licenses/by/4.0/ Attribution 4.0 International (CC BY 4.0)
    Osmundaceae
    http://www.worldfloraonline.org/organisation/Osmundaceae
    World Flora Online Data. 2021.
    • G CC0 1.0 Universal (CC0 1.0).
    World Flora Online Consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2017.
    • H CC0 1.0 Universal (CC0 1.0).