Hygrohypnum smithii
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Hygrohypnum smithii |
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| ( Sw. ) Broth. |
Hygrohypnum smithii (German names: Arktisches Wasserschlafmoos , Smiths Wasserschlafmoos ) is a deciduous moss species from the Amblystegiaceae family .
features
Hygrohypnum smithii is bound to water locations and forms dark green to blackish cushion lawns. The moderately strong and rather stiff plants are branched in tufts. The leaves are only about 1 millimeter in size and almost circular to broadly oval with a very short, broad and blunt tip, flat or slightly bent leaf margins and a strong, simple or, more rarely, forked rib that extends to the center of the leaf or three quarters of the leaf length. The cells in the middle of the leaf are rhombic to linear and serpentine, shortened in the leaf tip and base; likewise the leaf margins show a slightly indicated border of shorter cells. Leaf-wing cells are hardly differentiated.
The species rarely fruit. The seta is up to 12 millimeters long, the capsule is elongated and slightly inclined, the lid is conical with a blunt wart. The finely papillary spores measure 14 to 20 micrometers.
Location claims and distribution
Hygrohypnum smithii grows on waterfalls and in streams with clear, cool, nutrient-poor, lime-poor, but oxygen-rich water on trickled, lime-free rocks.
It occurs in the mountainous regions of Western, Central and Eastern Europe, in the Pyrenees and in Northern Europe, as well as in the Caucasus , in Western Siberia, in North America and on Greenland.
The species is rare to extremely rare and endangered in Germany and Switzerland.
Systematics
The systematic classification of the species appears controversial; lately it is placed in the genus Ochyraea as Ochyraea smithii (Sw.) Ignatov & Ignatova. The allocation of the genus Ochyraea is partly to the family Amblystegiaceae , partly to the family Hypnaceae
Individual evidence
- ↑ www.theplantlist.org
- ↑ 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 , p. 235.
literature
- Jan-Peter Frahm , Wolfgang Frey : Moosflora (= UTB . 1250). 4th, revised and expanded edition. Ulmer, Stuttgart 2004, ISBN 3-8252-1250-5 .
- Martin Nebel, Georg Philippi (ed.): The mosses of Baden-Württemberg. Volume 2: Special part, (Bryophytina II, Schistostegales to Hypnobryales). Ulmer, Stuttgart 2001, ISBN 3-8001-3530-2 .
