Christensenia (plant)

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.

For the broad-nosed weevil genus, see Christensenia (beetle).

Christensenia
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Marattiales
Family: Marattiaceae
Genus: Christensenia
Maxon
Synonyms

Kaulfussia C.Presl

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:

gollark: D looks neat, as a "somewhat sensible Go", but for some reason people preferred... using Go, because they're wrong.
gollark: Arguably this is *sort of* OCaml, but it seems to have accumulated lots of cruft and the tooling/ecosystem is no.
gollark: What I would really like is a Rust-like language with garbage collection and nicer ML-family syntax, with Rust's nice type system and tooling.
gollark: Yes.
gollark: In my foolish youth, I "learned" Go, and also C++.

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.
  • Rolleri, C. H. 1993. Revision of the genus Christensenia. Amer. Fern J. 83(1): 3-19.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.