Dicksoniaceae


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Dicksoniaceae

[‚dik·sə·nē′ās·ē‚ē]
(botany)
A family of tree ferns characterized by marginal sori which are terminal on the veins and protected by a bivalved indusium.
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Dicksonia sellowiana (Figura 1), es un helecho arborescente, perteneciente a la familia Dicksoniaceae que se distribuye desde el sur de Mexico hasta Brasil y Uruguay en alturas entre los 60 m y los 3800 m.
Seven families present monolete spores (Aspleniaceae, Blechnaceae, Dryopteridaceae, Gleicheniaceae, Lomariopsidaceae, Polypodiaceae y Thelypteridaceae), eight present trilete spores (Cyatheaceae, Dicksoniaceae, Grammitidaceae, Hymenophyllaceae, Lophosoriaceae, Lycopodiaceae, Plagiogyriaceae y Pteridaceae), one family presents both spore types (Dennstaedtiaceae) and only Equisetaceae presents alete spores.
Las esporas de los pteridofitos presentes en la vereda Marilandia, presentaron lesura de tipo trilete en ocho familias (Cyatheaceae, Dicksoniaceae, Grammitidaceae, Hymeno-phyllaceae, Lophosoriaceae, Lycopodiaceae, Plagiogyriaceae y Pteridaceae) y lesura monolete en siete familias (Aspleniaceae, Blechnaceae, Dryopteridaceae, Gleicheniaceae, Lomariopsidaceae, Polypodiaceae y Thelypteridaceae).
Por el contrario, las familias carentes de perisporio fueron Cyatheaceae, Dicksoniaceae, Gleichenia-ceae, Grammitidaceae, Hymenophyllaceae, Lycopodiaceae y Plagiogyriaceae.
Although no fern macrofossils have been seen in the Newvale leafbeds, spores include Cyatheaceae, Davalliaceae, Dicksoniaceae, Gleicheniaceae, Osmundaceae, Hymenophyllaceae, Polypodiaceae and Psilotaceae.
Representatives of tree fern families such as Cyatheaceae and Dicksoniaceae, and forest taxa including Gleicheniaceae, Hymenophyllaceae and Osmundaceae have been important components of the forest understory in New Zealand since at least the late Eocene and possibly since the late Cretaceous (Mildenhall, 1980; Cieraad & Lee, 2006).
La informacion que se ha publicado para la especie en Colombia, se limita al tratamiento taxonomico realizado para Dicksoniaceae (C.
A majority of leptosporangiate diversity was encompassed by the apparently more highly derived species that Bower (1923-1928) included in the Polypodiaceae and Dicksoniaceae and that Copeland (1947) and more recent authors have recognized as a variable number of distinct families (Pteridaceae, Davalliaceae, Aspleniaceae, Aspidiaceae, Blechnaceae, Polypodiaceae, etc.