Christensenia (plant)

Genus of ferns

Christensenia

Scientific classification
Kingdom:  | Plantae
Clade:  | Tracheophytes
Division:  | Polypodiophyta
Class:  | Polypodiopsida
Order:  | Marattiales
Family:  | Marattiaceae
Genus:  | Christensenia
Maxon
Type species
Christensenia aesculifolia

(Blume) Maxon

Synonyms

Kaulfussia C.Presl

Christensenia is a genus of ferns in the botanical family Marattiaceae. The genus is confined to the Indo-Malayan region. The basal chromosome number for this genus is 2n=80.

Christensenia is unique in the Marattiaceae, because of its reticulate venation, palmately arranged leaves and radial synangia. Christensenia produces enormous amounts of spores, up to 7,000 spores per sporangium. The presence of a radial synangium is an archaic character, very similar to some of the fossil Asterothecaceae/Psaroniaceae, such as Scolecopteris. Christensenia itself has no fossil record.

## Species

[edit]

After the 1993 revision by Rolleri, only two species and one variety are recognized:

* Christensenia aesculifolia (Blume) Maxon (type species)
* Christensenia aesculifolia var. korthalsii
* Christensenia lobbiana (de Vriese) Rolleri

## References

[edit]

Wikispecies has information related to Christensenia.

* BRUMMITT, R. K. (1992) Vascular plant families and genera. Royal Botanic Gardens
* Pink, A. (2004). Gardening for the Million. Project Gutenberg Literary Archive Foundation.
* Rolleri, C. H. 1993. Revision of the genus Christensenia. Amer. Fern J. 83(1): 3–19.

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Classification of Archaeplastida or Plantae s.l.

Domain
Archaea
Bacteria
Eukaryota
(major groups
Metamonada
Discoba
Diaphoretickes

Hacrobia

Cryptista
Rhizaria
Alveolata
Stramenopiles
Plants
Amorphea

Amoebozoa
Opisthokonta

Animals
Fungi
Mesomycetozoea)

| incertae sedis|

* †Algospongia

|

Glaucoplantae|

| Glaucophyta|

* Glaucocystophyceae

|

| Rhodoplantae|

| Picozoa|

* Picomonadea

|

Rhodelphidia|

* Rhodelphea

Rhodophyta
(red algae)|

| Cyanidiophytina|

* Cyanidiophyceae

|

Proteorhodophytina|

* Porphyridiophyceae
* Stylonematophyceae
* Compsopogonophyceae
* Rhodellophyceae

Eurhodophytina|

* Bangiophyceae
* Florideophyceae

Viridiplantae or Plantae s.s.
(green algae & land plants)|

| Prasinodermophyta|

* Prasinodermophyceae
* Palmophyllophyceae

|

Chlorophyta|

| Prasinophytina|

* Mamiellophyceae
* Pyramimonadophyceae

|

Chlorophytina|

* Nephroselmidophyceae
* Picocystophyceae
* Chloropicophyceae
* Pedinophyceae
* Chlorodendrophyceae
* UTC clade
* Ulvophyceae
* Trebouxiophyceae
* Chlorophyceae

| Streptophyta|

| Chlorokybophytina|

* Mesostigmatophyceae
* Chlorokybophyceae
* Spirotaeniaceae

|

Klebsormidiophytina|

* Klebsormidiophyceae

| Phragmoplastophyta|

| Charophytina|

* Charophyceae

|

Coleochaetophytina|

* Coleochaetophyceae

| Anydrophyta|

| Zygnematophytina|

* Zygnematophyceae

|

| Embryophyta
(land plants)|

| Bryophytes|

| Marchantiophyta
(liverworts)|

* Haplomitriopsida
* Marchantiopsida
* Jungermanniopsida

|

Anthocerotophyta
(hornworts)|

* Leiosporocerotopsida
* Anthocerotopsida

Bryophyta
(mosses)|

* Takakiopsida
* Sphagnopsida
* Andreaeobryopsida
* Andreaeopsida
* Oedipodiopsida
* Tetraphidopsida
* Polytrichopsida
* Bryopsida

Polysporangiophytes|

| †Protracheophytes*|

* †Aglaophyton
* †Eophytidae
* †Horneophytopsida

|

| Tracheophytes
(vascular plants)|

| †Paratracheophytes*|

* †Cooksoniopsida
* †Renaliales
* †Rhyniopsida

|

| Eutracheophytes|

| Lycophytes|

* †Barinophytopsida
* †Zosterophyllopsida
* Lycopodiopsida (clubmosses, spikemosses & quillworts)

|

| Euphyllophytes|

* †Eophyllophytopsida
* †Trimerophytopsida

Moniliformopses|

* †Ibykales
* †Cladoxylopsida
* Polypodiopsida (ferns and horsetails)

| Lignophytes|

| †Progymnosperms*|

* †Aneurophytopsida
* †Archaeopteridopsida
* †Noeggerathiopsida
* †Protopityales

|

| Spermatophytes
(seed plants)|

| †Pteridosperms*
(seed ferns)
and other extinct
seed plant groups|

* †Bennettitales
* †Calamopityales
* †Callistophytales
* †Caytoniales
* †Cordaitales
* †Corystospermales
* †Czekanowskiales
* †Gigantopteridales
* †Glossopteridales
* †Lyginopteridopsida
* †Medullosales
* †Peltaspermopsida
* †Pentoxylopsida
* †Petriellales

|

Acrogymnospermae
(living gymnosperms)|

* Cycadopsida (cycads)
* Ginkgoales (Ginkgo)
* Pinopsida (conifers)
* Gnetopsida

Angiospermae
(flowering plants)|

* Basal angiosperms
* Core angiosperms
* Magnoliids
* Monocots
* Eudicots

* *paraphyletic groups
* † = extinct
* List of plant orders
* Current definitions of Plantae

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Fern classification

* Kingdom Plant:
* Rhodophyta
* Chlorophyta
* Marchantiophyta
* Bryophyta
* Anthocerotophyta
* Polypodiophyta
* Acrogymnospermae
* Angiospermae

| Basal clade|

* †Ibykales
* †Ibykaceae

|

†Cladoxylopsida|

* †Cladoxylales
* †Cladoxylaceae
* †Voelkeliaceae
* †Hyeniales
* †Hyeniaceae
* †Iridopteridales
* †Iridopteridaceae
* †Pseudosporochnales
* †Pseudosporochnaceae
* †Steloxylales
* †Steloxylaceae

| Polypodiopsida|

| †Stauropterididae|

* †Stauropteridales
* †Stauropteridaceae

|

†Zygopterididae|

* †Rhacophytales
* †Rhacophytaceae
* †Zygopteridales
* †Zygopteridaceae

Equisetidae|

* †Pseudoborniales
* †Pseudoborniaceae
* †Sphenophyllales
* †Aspidostachyaceae
* †Boegendorfiaceae
* †Boegendorfiaceae
* †Eviostachyaceae
* †Sphenophyllaceae

Equisetales|

* †Asterocalamitaceae
* †Autophyllitaceae
* †Honseleriaceae
* †Archaeocalamitaceae
* †Paracalamitaceae
* †Calamitaceae
* †Apocalamitaceae
* †Konnostachyaceae
* †Manchurostachyaceae
* †Notocalamitaceae
* †Schizoneuraceae
* †Sorocaulinaceae
* †Echinostachyaceae
* †Gondwanostachyaceae
* †Tchernoviaceae
* Equisetaceae

Ophioglossidae|

| Psilotales|

* Psilotaceae

|

Ophioglossales|

* Ophioglossaceae

Marattiidae|

| Marattiales|

* †Knorripteridaceae
* †Pecopteridaceae
* †Ptychocarpaceae
* †Weichseliaceae
* †Asterothecaceae
* †Danaeopsidaceae
* Marattiaceae

|

| Polypodiidae|

* †Anachoropteridales
* †Anachoropteridaceae
* †Psalixochlaenaceae
* †Sermayaceae
* †Botryopteridiales
* †Botryopteridiaceae
* †Senftenbergiales
* †Senftenbergiaceae
* †Urnatopteridales
* †Crossothecaceae
* †Discopteridaceae
* †Urnatopteridaceae

Osmundales|

* †Guaireaceae
* Osmundaceae

Hymenophyllales|

* Hymenophyllaceae

Gleicheniales|

* †Oligocarpiaceae
* Dipteridaceae
* Gleicheniaceae
* Matoniaceae

Schizaeales|

* †Acrostichopteridaceae
* †Cynepteridaceae
* †Klukiaceae
* †Stachypteridaceae
* †Tempskyaceae
* Anemiaceae
* Lygodiaceae
* Schizaeaceae

Salviniales|

* †Heroleandraceae
* Marsileaceae
* †Hydropteridiaceae
* Salviniaceae

Cyatheales|

| Thyrsopteridineae|

* Thyrsopteridaceae
* Loxsomataceae
* Plagiogyriaceae
* Culcitaceae

|

Cyatheineae|

* †Tanydoraceae
* Metaxyaceae
* Cibotiaceae
* Dicksoniaceae
* Cyatheaceae

Polypodiales|

| Saccolomatineae|

Saccolomataceae

|

Lindsaeineae|

* Cystodiaceae
* Lonchitidaceae
* Lindsaeaceae

Pteridineae|

Pteridaceae

Dennstaedtiineae|

Dennstaedtiaceae

Aspleniineae|

* Cystopteridaceae
* Rhachidosoridaceae
* Diplaziopsidaceae
* Hemidictyaceae
* Desmophlebiaceae
* Aspleniaceae
* Thelypteridaceae
* Woodsiaceae
* Onocleaceae
* Blechnaceae
* Athyriaceae

Polypodiineae|

* Hypodematiaceae
* Didymochlaenaceae
* Dryopteridaceae
* Lomariopsidaceae
* Nephrolepidaceae
* Tectariaceae
* Oleandraceae
* Davalliaceae
* Polypodiaceae

Taxon identifiers

Christensenia|

* Wikidata: Q5109183
* Wikispecies: Christensenia (Marattiaceae)
* CoL: 3P96
* EoL: 3364531
* FoC: 106919
* GBIF: 3229391
* GRIN: 17441
* iNaturalist: 446821
* IPNI: 296762-2
* IRMNG: 1039406
* ITIS: 897972
* NCBI: 491816
* Open Tree of Life: 840952
* POWO: urn:lsid:ipni.org:names:296762-2
* Tropicos: 40008222
* WFO: wfo-4000008134

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