Loxsomataceae
| Loxsomataceae | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Loxsoma cunninghamii , illustration |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Loxsomataceae | ||||||||||||
| C. Presl |
The Loxsomataceae are a family of tree ferns (Cyatheales). The spelling should be Loxsomataceae - not Loxomataceae - otherwise it could be confused with an orchid genus.
.jpg)
features
The rhizomes are long creeping, have a solenostele and have hair with a round, multicellular base. The leaf blades are double or multiple pinnate. The nerves are free-ended and forked. The hair is single or multicellular.
The sori are on the edge of the leaf (marginal) at the end of nerves. Each sorus has an urn-shaped indusium and an elongated, often raised receptacle . The sporangia stand on thick, short stalks and have a slightly opaque annulus. The spores are tetrahedral and trilet (three-part scar).
The gametophyte has flaky hair.
The basic chromosome number is x = 46 or 50.
distribution
The family occurs in the South American Andes , in southern Central America , and in New Zealand .
Systematics
The Loxsomataceae consist of two monotypical genera. The family is monophyletic . Smith et al. (2006) give the following two genera:
-
Loxsoma
R. Br. Ex A. Cunn. , with only one species in New Zealand:
- Loxsoma cunninghamii R. Br. Ex A. Cunn.
-
Loxsomopsis Christ , with a species in tropical America:
- Loxsomopsis pearcei (Baker) Maxon .
literature
- Alan R. Smith, Kathleen M. Pryer, Eric Schuettpelz, Petra Korall, Harald Schneider, Paul G. Wolf: A classification for extant ferns. In: Taxon. Volume 55, No. 3, 2006, ISSN 0040-0262 , pp. 705-731, abstract, PDF file .
- David J. Mabberley: The Plant Book. A portable dictionary of the higher plants. Cambridge University Press, Cambridge et al. 1987, ISBN 0-521-34060-8 .
- Marcus Lehnert, Maren Mönnich, Thekla Pleines, Alexander Schmidt-Lebuhn and Michael Kessler: The relictual fern genus Loxsomopsis . In: American Fern Journal, vol. 91 (1), p. 13-24, 2001. [1]
