Meesia uliginosa (deutsch Haar-Bruchmoos, Sumpf-Bruchmoos) ist eine Laubmoos-Art aus der Familie Meesiaceae.
Meesia uliginosa bildet gelblich grüne Rasen, die in tiefen Lagen bis 10 Zentimeter, in den Alpen oft nur um 1 Zentimeter hoch werden. Die Pflanzen sind verzweigt und unten rostrot rhizoidfilzig. Die aufrecht abstehenden bis einseitswendigen Blätter sind bis über 3 Millimeter lang und 0,8 Millimeter breit, schmal zungenförmig bis linealisch und stumpf gespitzt. Die Blattränder sind stark umgerollt. Die sehr breite Rippe endet in der Blattspitze und zeigt im Querschnitt kleine Außen- und größere Innenzellen. Die Blattzellen sind quadratisch bis schmal rechteckig und etwa 10 Mikrometer breit. Die bräunliche, schwach gekrümmte und stumpfdeckelige Sporenkapsel wird von der bis 8 Zentimeter langen Seta über den Moosrasen empor gehoben. Sporen sind fein papillös, gelblich grün und 40 bis 56 Mikrometer groß.
Das Moos wächst an schattigen, feuchten bis nassen und kalk- oder basenreichen Standorten, besonders auf Humus an Böschungen oder Hanganrissen, unter Krummholz, auf Kalkgestein oder in Flachmooren. In den Alpen – hier ist es die häufigste Art der Gattung – kommt es in Höhenlagen von etwa 700 bis 3000 Metern häufig bis zerstreut vor. In Deutschland kam es früher außerhalb der Alpen im ganzen Gebiet vereinzelt auf geeigneten Moorstandorten vor, ist heute jedoch verschollen, von einem Fund im Erzgebirge aus jüngster Zeit abgesehen.[1]
Weltweit ist die Art zirkumpolar verbreitet.
Meesia uliginosa (deutsch Haar-Bruchmoos, Sumpf-Bruchmoos) ist eine Laubmoos-Art aus der Familie Meesiaceae.
Meesia uliginosa, the broad-nerved hump-moss,[1] is a rare moss of the Western U.S. It occurs all around the northern hemisphere in higher latitudes, and in some places is not as rare as in the Western U.S.
Plant autoicous, but many plants with only antheridia or archegonia; plants often fertile. Stems 1–4 cm long, often branched, sans hyaloderm. Basal cells of persistent axillary hairs numerous, strongly reddened. Leaves erect, linear to ligulate-lingulate, never squarrose-recurved, somewhat contorted when dry, smaller at base of stem than larger above, ¾–4½ mm long; margins entire, revolute (i.e., strongly recurved); costa strong, broad (⅓ to ⅔ width of leaf base), ends near leaf apex; apex blunt, obtuse to rounded. Seta very long (1½–10 cm). Capsule pyriform, asymmetrical, curved, up to 4 mm long including neck; neck long, often wrinkled when dry; endostome of 16 segments open on the keel, sometimes with evidence of cilia; outer peristome shorter than the inner. Spores finely papillose.[2][3][4][5][6]
This species has a bipolar distribution, meaning that it exists in both hemispheres. In the Northern hemisphere, it is circumboreal, being found in Greenland, Canada, the northern United States, the Baltic, Russia, and Mongolia. It is also known from South America and nearby places in Antarctica.[5][7]
This moss lives in fens, peaty soil banks, seeps, meadows, and rock fissures upon exposed, damp organic soil within upper montane to subalpine coniferous forest. More specifically, it prefers to live upon calcareous substrates, usually in alpine or arctic regions, but occurring also in rich fens at lower elevations. Its elevational range is from 3,950 ft. to 8,550 ft.[5][8]
The fire ecology of this plant is not known; however, fens rarely burn. Excess soot from a nearby fire, however, might negatively affect habitat quality. Fire return intervals in conifer bogs, a somewhat similar mire-type habitat, are estimated to be about once every 150–200 years. Fire does significant damage to peat, but the bog must be dry (as during a drought year) in order to burn; typically, bogs are not dry enough.[9]
U.S. Forest Service Pacific Southwest Region Sensitive Species.
California Native Plant Society List 2.2
NatureServe California State Rank: S2.2; Global Rank: G4
Fens are delicate habitats susceptible to impacts from livestock grazing, hydrologic alteration, construction and continued use of roads, and peat mining.[10] Rich fen habitats are especially susceptible to modification. The surface water chemistry of rich fens is sensitive to climatic and anthropogenic influences.[11]
Meesia uliginosa may be distinguished from M. triquetra by its lack of tristichous growth habit, relatively wide costa, entire and revolute leaf margins, blunt leaf apex, and autoicous sexual condition.[3][6][8][11]
Meesia uliginosa, the broad-nerved hump-moss, is a rare moss of the Western U.S. It occurs all around the northern hemisphere in higher latitudes, and in some places is not as rare as in the Western U.S.
Meesia uliginosa là một loài Rêu trong họ Meesiaceae. Loài này được Hedw. mô tả khoa học đầu tiên năm 1801.[1]
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Meesia uliginosa là một loài Rêu trong họ Meesiaceae. Loài này được Hedw. mô tả khoa học đầu tiên năm 1801.
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