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  1. Family: Polypodiaceae J.Presl & C.Presl
    1. Megalastrum Holttum

      1. This genus is accepted, and is native to Africa, Antarctic, Southern America and Northern America..


    Dryopteridaceae, JP Roux, M Shaffer-Fehre, B Verdcourt. Flora of Tropical East Africa. 2007

    Plants terrestrial.
    Rhizome erect, massive.
    Fronds tufted, large, fertile more open than sterile; stipes and rachis with adaxial groove, discontinuous with grooves of lower order axes; blade pinnately compound, pinnae deeply lobed; venation free, simple or forked ending close to or in margin, both anadromous and catadromous.
    Indumentum of ctenitoid hairs present in most species, in some species with pluricellular, curved, rigid, ± acicular hairs, and small short and long unicellular glandular hairs, uniseriate cylindrical hairs and acicular hairs along axes and adaxial lamina
    Sori small, circular, on vein branches; sporangium long-stalked, 13–15 indurated cells, indusium reniform with unicellular glands, cylindrical & acicular hairs superficially and along margins
    Spores monolete , fusiform with blunt tips , echinate, 40–50 mm long
    Approximately 30 species in the Neotropics; one of these extending to Africa and the Madagascan region.



    Native to:

    Amsterdam-St.Paul Is, Angola, Argentina Northeast, Argentina Northwest, Argentina South, Belize, Bolivia, Brazil Northeast, Brazil South, Brazil Southeast, Cameroon, Cape Provinces, Chile Central, Chile South, Colombia, Comoros, Costa Rica, Cuba, Dominican Republic, Ecuador, Equatorial Guinea, Gabon, Galápagos, Ghana, Guatemala, Guinea, Gulf of Guinea Is., Haiti, Honduras, Ivory Coast, Jamaica, Juan Fernández Is., Kenya, KwaZulu-Natal, Leeward Is., Liberia, Madagascar, Malawi, Mauritius, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Mozambique, Nicaragua, Nigeria, Northern Provinces, Panamá, Paraguay, Peru, Puerto Rico, Réunion, Senegal, Sierra Leone, Tanzania, Trinidad-Tobago, Tristan da Cunha, Uruguay, Venezuela, Venezuelan Antilles, Windward Is., Zaïre, Zimbabwe

    Accepted Species

    Other Data

    Megalastrum Holttum appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Mar 1, 2013 Preston, T.A. [s.n.], Brazil K000957109
    Mar 1, 2013 s.coll. [s.n.], Brazil K000957110
    Mar 1, 2013 Annies, I. [117], Brazil K000957111
    Annies [117], Brazil K000957112
    s.coll. [s.n.], Brazil K000957104


    First published in Gard. Bull. Singapore 39(2): 161 (1987)

    Accepted by

    • Roskov Y. & al. (eds.) (2018). World Ferns: Checklist of Ferns and Lycophytes of the World Species 2000 & ITIS Catalogue of Life Naturalis, Leiden, the Netherlands.


    Flora of Tropical East Africa

    • Gard. Bull. Straits Settlements 39: 161 (1987)


    Flora of Tropical East Africa
    Flora of Tropical East Africa

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
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    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. Published on the Internet at and
    © Copyright 2017 World Checklist of Selected Plant Families.

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. Published on the Internet at and
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families.