Christensenia (plant)

Short description: 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

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

* BRUMMITT, R. K. (1992) Vascular plant families and genera. Royal Botanic Gardens
* Pink, A. (2004). Gardening for the Million. Project Gutenberg Literary Archive Foundation. https://www.gutenberg.org/ebooks/11892.
* Rolleri, C. H. 1993. Revision of the genus Christensenia. Amer. Fern J. 83(1): 3–19.

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Classification of Archaeplastida / Plantae sensu lato

Domain
Archaea
Bacteria
Eukaryota
(Supergroup
Plant
Hacrobia
Heterokont
Alveolata
Rhizaria
Excavata
Amoebozoa
Opisthokonta

Animal
Fungi)

Rhodophyta
(red algae)|

* Cyanidiophyceae
* Porphyridiophyceae
* Compsopogonophyceae
* Stylonematophyceae
* Rhodellophyceae
* Bangiophyceae
* Florideophyceae

Glaucocystophyta
(glaucophytes)|

* Glaucocystophyceae
* Glaucocystis
* Cyanophora
* Gloeochaete

Viridiplantae
(green algae,
& land plants)|

| M+C+S|

* Mesostigmatophyceae
* Chlorokybophyceae
* Spirotaenia

|

C+S|

| Chlorophyta
(prasinophytes)|

* Mamiellophyceae
* Nephrophyceae
* Palmophyllales
* Prasinophyceae
* Pseudoscourfieldiales
* Pyramimonadophyceae
* Scourfieldiales
* Pedinophyceae
* Chlorodendrophyceae
* UTC clade
* Ulvophyceae
* Trebouxiophyceae
* Chlorophyceae

|

Streptophyta
(charophytes,
& land plants)|

* Klebsormidiophyceae

Phragmo-
plastophyta|

* Charophyceae
* Coleochaetophyceae
* Zygnematophyceae
* Mesotaeniaceae

Embryophyta
(land plants)|

| Bryophytes
(non-vascular)|

* Marchantiophyta
* Anthocerotophyta
* Bryophyta "Moss"
* †Horneophytopsida

|

Tracheophyta
(vascular)|

| Lycopodiophyta
(microphylls)|

* †Zosterophyllopsida
* †Sawdoniales
* Isoetopsida
* Lycopodiopsida

|

Euphyllophyta
(megaphylls)|

| Polypodiopsida
(ferns)|

* †Cladoxylopsida
* †Stauropteridales
* †Zygopteridales
* Equisetidae
* Ophioglossidae
* Marattiidae
* Polypodiidae

|

Spermatophyta
(seed plants)|

* †Seed ferns
* Gymnosperms
* Gnetopsida
* Pinopsida
* Cycadopsida
* Ginkgoopsida
* Angiosperms or flowering plants
* Amborellales
* Nymphaeales
* Austrobaileyales
* Magnoliids
* Monocots
* Eudicots

Other|

* †Trimerophytopsida
* †Progymnosperm

Other|

* †Rhyniopsida

† = extinct. See also the list of plant orders.

Wikidata ☰ Q5109183 entry

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