Ceratopteris

Ceratopteris is the only genus among homosporous ferns that is exclusively aquatic. It is pan-tropical and classified in the Parkerioideae subfamily of the family Pteridaceae.

Species

GENUS

KingdomPlantae
PhylumTracheophyta
ClassPolypodiopsida
OrderPolypodiales
FamilyPteridaceae

Habitatfreshwater

Native toAlabama, Andaman Is., Angola, Argentina Northeast, Assam, Bangladesh, Benin, Bismarck Archipelago, Bolivia, Botswana, Brazil Northeast, Brazil Southeast

Observations recorded10,853

Ceratopteris is een geslacht met vier of vijf soorten varens uit de lintvarenfamilie (Pteridaceae). Alle Ceratopteris-soorten zijn water- of moerasplanten, en daardoor uitzonderlijk onder de varens. Ze komen wereldwijd voor in tropische moerasgebieden. Inhoud 1 Naamgeving en etymologie 2 Kenmerken 3 Taxonomie 3.1 Soortenlijst Naamgeving en etymologie Synoniem: Cryptogenis Richard ms. ex Brongn. (1823), Ellebocarpus Kaulf. (1824), Furcaria Desv. (1827), Parkeria Hook. (1825), Teleozoma R. Br. (1823) Engels: Water ferns, Antlerferns De botanische naam Ceratopteris is afgeleid van het Oudgriekse κέρας, keras (hoorn) en πτερίς, pteris (veer, vleugel, varen),[bron?] naar het geweivormige fertiele blad. Kenmerken Het geslacht omvat aquatische varens gekenmerkt door korte, kruipende of rechtopstaande, vlezige wortelstokken en tot 1,2 m lange bladen met een eveneens vlezige, geribde, met luchtkanalen gevulde bladsteel. De bladsteel bevat een ring van vaatbundels. De bladen zijn dimorf, de buitenste steriele bladen uitgespreid, breed ovaal, twee- tot drievoudig gedeeld, met brede, dunbladige bladslipjes; de binnenste, fertiele bladen rechtopstaand, langer en smaller en fijner verdeeld dan d

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Wikidata facts

Image: Ceratopteris cornuta in aquarium alone.jpg

Show 4 more facts

taxon name: Ceratopteris
GRIN URL: npgsweb.ars-grin.gov/gringlobal/taxonomygenus.aspx?id=17250
Commons category: Ceratopteris
taxon common name: 水蕨属

Sources (2)

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~6 min read

Article

9 sections

Contents

Description
Taxonomy
Phylogeny
Distribution and habitat
Outcrossing and self-fertilization
Toxicity
Uses
References
Further reading

Ceratopteris is the only genus among homosporous ferns that is exclusively aquatic. It is pan-tropical and classified in the Parkerioideae subfamily of the family Pteridaceae.

==Description== thumb|Ceratopteris cornuta in detail Erect aquatic or subaquatic ferns of moderate size. Rhizome short, fleshy, horizontal and ascending to erect, loosely rooted in the mud or +/- floating, radial, dictyostelic with numerous meristeles and medullary strands, young parts bearing thin, ovate, +/- cordate, clathrate scales. Fronds stipitate, the stipes fleshy, with numerous longitudinal air canals, abaxially rounded and ribbed, adaxially flattened, vascular bundles in a peripheral ring, one with each rib and several to the adaxial side, and several smaller medullary strands; lamina dimorphic, sterile fronds +/- spreading, 2–3-pinnatifid with broad membranous lobes, venation reticulate without included free veinlets, often with proliferous buds in the axils; fertile fronds erect, longer, narrower and more divided than the sterile, the lobes strongly recurved to completely cover the adiaxial surface, venation longitudinal, branching at the bases of the lobes. Sporangia solititary, scattered along the veins, exindusiate but protected by the continuous reflexed margin of the lamina, large, short-stalked, annulus broad, irregular, of 30–70 thickened cells, or lacking, containing 16 to 32 spores. Spores large, trilete, ribbed with irregular long meshes.