Treubiaceae
| Treubiaceae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the class | ||||||||||||
| Treubiopsida | ||||||||||||
| Stabbing , J.-P.Frahm , Hilger & W.Frey | ||||||||||||
| Scientific name of the order | ||||||||||||
| Faithful | ||||||||||||
| Schljakov | ||||||||||||
| Scientific name of the family | ||||||||||||
| Treubiaceae | ||||||||||||
| Verd. |
The Treubiaceae are a family of liverworts with only two genera and represent a separate order Treubiales and the class Treubiopsida .
features
The Treubiaceae have a thallus about ten centimeters long . This is lobed and neither clearly thallous nor folious. Scale-like organs (dorsal scales) sit on the top. The gametangia are formed under these . This structure, unique within the moss, is interpreted in different ways: on the one hand as two lobes of a leaf, on the other hand as an intermediate structure between the thallus and the leafy plant. The thallus has complex oil cells and cones rhizoide , characteristics of the Marchantiopsida . The position of the gametangia in leaf axils is a feature of the Jungermanniopsida . Features that the group does not share with any other are a square apex cell and ventral papillae. The blepharoplast, a structure of the spermatozoid , is similar to that of haplomitrium . The connection between sporophyte and gametophyte occupies a middle position between the forms of Marchantiopsida and Jungermanniopsida.
Systematics
The group was formerly placed as a family in the order of Metzgeriales . The group, however, has characteristics of both the Marchantiopsida and the Jungermanniopsida. Molecular family trees also place the Treubiales at the base of liverworts. This is interpreted to the effect that Treubia or their ancestors stood at the starting point of the evolution of liverwort groups.
There are only two types:
- Treubia with six kinds
- Apotreubia with four kinds
From the carbon is Treubiites kidstonii been described, which is very similar to today's species. The temporarily assumed relationship is rejected today.
Occurrence
The genus Treubia is common in parts of the former Gondwana continent, Apotreubia is native to India and on both sides of the Pacific in East Asia and North America.
literature
- Jan-Peter Frahm : Biology of Mosses . Spectrum Akademischer Verlag, Heidelberg et al. 2001, ISBN 3-8274-0164-X .
- Jan-Peter Frahm, Wolfgang Frey : Moosflora (= UTB . 1250). 4th, revised and expanded edition. Ulmer, Stuttgart 2004, ISBN 3-8252-1250-5 .
Individual evidence
- ↑ Wolfgang Frey, Eberhard Fischer, Michael Stech: Bryophytes and seedless Vascular Plants . In: Wolfgang Frey (Ed.): Syllabus of Plant Families - A. Engler's Syllabus of Plant Families . 13th edition. tape 3 . Borntraeger, Berlin / Stuttgart 2009, ISBN 978-3-443-01063-8 , pp. 23 .