Grim
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Cushion moss ( Grimmia pulvinata ) |
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The Grimmiales are an order of the moss . They are usually persistent and robust species that form dense cushions or lawns on stones and rocks. That is why they usually grow in open, bright locations.
features
In many species of this order a transition from acrocarpy to pleurocarpy can be observed. The plants then form prostrate to ascending, only weakly branched stems.
The leaves are mostly lanceolate with a midrib. Often the leaf ends in a hyaline hair tip. The cells often have thick cell walls. In some species, the cell walls are also irregularly knotty thickened. In many species, the leaves also consist of two layers of cells.
The sporophyte has a short seta that is straight or U-shaped bent back into the cushion. The kalyptra is large and usually has the shape of a hat. The sporogon is egg-shaped to cylindrical. The peristome is haplolepid.
Systematics
The order includes three families
- Grimmiaceae with 10 genera and around 330 species, worldwide
- Seligeriaceae with 5 genera and 48 species, mostly moderate latitudes
- Ptychomitriaceae with 5 genera and 62 species, mostly moderate latitudes
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 .
Web links
Individual evidence
- ↑ Wolfgang Frey, Michael Stech, Eberhard Fischer: Bryophytes and Seedless Vascular Plants (= Syllabus of Plant Families. 3). 13th edition. Borntraeger, Berlin et al. 2009, ISBN 978-3-443-01063-8 , pp. 156-161.