Mnium spinosum
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Mnium spinosum |
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| (Voit) Schwägr. |
Mnium spinosum (German Dornzähniges Sternmoos ) is a moss - kind from the family Mniaceae .
features
The plants grow in loose and easily crumbling lawns and reach heights of up to 6 centimeters. The red to red-brown stems are flaky at the bottom and almost flaky at the top. Sterile shoots often have a somewhat arched growth habit.
The leaves are very curly when dry and protruding when moist. They are up to 8 millimeters long and 3.5 millimeters wide, broadly lanceolate to obovate, sharply pointed and transversely wavy. The lined edges of the leaf are covered with sharp double teeth down to the middle of the leaf. The shortly emerging leaf veins are bluntly serrated or, less often, smooth on the underside. The cells of the leaf base are elongated and rectangular, those of the middle of the leaf are oblong-rectangular or hexagonal, without significant corner thickening, 15 to 43 micrometers long, 12 to 22 micrometers wide and are arranged in diagonal rows.
Sporogons are usually several (2 - 7), rarely arranged individually. The purple seta is about 1.5 to 2 centimeters long, the nodding to pendulous capsule is elongated and slightly curved, the lid is short and thickly beaked. The finely papillary spores are around 20 to 30 micrometers in size.
The gender distribution is diocesan .
Location requirements
The moss grows particularly in partially shaded to shady and slightly damp places in coniferous forests of montane to upper montane altitude. It is often associated with Plagiomnium affine , Mnium hornum and Rhytidiadelphus loreus .
distribution
In Germany, Austria and Switzerland, the main distribution is in the Alps and the Jura; the species is often common in these areas. Occurrences in the Alpine foothills, in the central German hill country and in the eastern low mountain ranges are very scattered or rare.
Worldwide, the occurrences are predominantly in the boreal zone of Eurasia and North America, south of which they are limited to montane or mountainous locations. In addition to Central and Northern Europe, Iceland, Svalbard, Pyrenees, Urals, Caucasus, Himalayas, Siberia, China and western North America are specified.
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 .
