Difference between revisions of "Plagiobryum demissum"
Öfvers. Kongl. Vetensk.-Akad. Förh. 19: 606. 1863.
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|basionyms={{Treatment/ID/Basionym | |basionyms={{Treatment/ID/Basionym | ||
|name=Bryum demissum | |name=Bryum demissum | ||
|authority=Hooker | |authority=Hooker | ||
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|publication_title=Musci Exot. | |publication_title=Musci Exot. | ||
|publication_place=2: plate 99. 1819 | |publication_place=2: plate 99. 1819 | ||
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|name=Meesia demissa | |name=Meesia demissa | ||
|authority=(Hooker) Hoppe & Hornschuch | |authority=(Hooker) Hoppe & Hornschuch | ||
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|hierarchy=Bryaceae;Plagiobryum;Plagiobryum demissum | |hierarchy=Bryaceae;Plagiobryum;Plagiobryum demissum | ||
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name=Plagiobryum demissum | name=Plagiobryum demissum | ||
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|authority=(Hooker) Lindberg | |authority=(Hooker) Lindberg | ||
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|publication title=Öfvers. Kongl. Vetensk.-Akad. Förh. | |publication title=Öfvers. Kongl. Vetensk.-Akad. Förh. | ||
|publication year=1863 | |publication year=1863 | ||
| − | |special status= | + | |special status=Illustrated |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V28/V28_246.xml |
|genus=Plagiobryum | |genus=Plagiobryum | ||
|species=Plagiobryum demissum | |species=Plagiobryum demissum | ||
Latest revision as of 21:34, 5 November 2020
Plants 0.6–1.5 cm, red to reddish brown. Stems 0.3–1.2 cm, innovations short, not julaceous. Leaves of innovations erect to erect-spreading, ovate-lanceolate to ovate, flat to slightly concave, 0.9–1.4 × 0.2–0.5 mm; margins recurved; apex slender, acute; costa ending in apex to distinctly excurrent, in transverse section abaxial stereid band 2–4 cells thick, 2–5 adaxial cells in 1 or 2 layers; leaves on fertile shoots more distinctly lanceolate; proximal laminal cells 3–5:1, walls thick; medial cells narrowly hexagonal or rhomboidal to rectangular, 12–20 µm wide mid leaf, 2.5–4.5:1, walls ± firm distally. Capsule pendulous, 2–5 mm, neck 0.5–1.2 times urn length; exostome yellowish to brown, to 1/2 endostome length, nearly smooth to distinctly striate throughout. Spores released in tetrads, (26–)28–35(–42) µm, strongly papillose, brown.
Phenology: Capsules mature late summer–fall.
Habitat: Moist, basic cliffs, humus soil in tundra
Elevation: low to high elevations (0-4200 m)
Distribution
Greenland, Alta., B.C., Nfld. and Labr., N.W.T., Nunavut, Yukon, Alaska, Colo., Europe, Asia.
Discussion
Plagiobryum demissum has a highly disjunct distribution that is usually associated with mountainous areas. Surprisingly, the species is rarely recorded from most areas of the Canadian Arctic. It is easily recognized when fertile by the combination of reddish gametophytes and pendulous, zygomorphic and distinctly gibbous capsules. When sterile, the plants are inconspicuous and practically indistinguishable from small reddish Bryum species.
Selected References
None.