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Polytrichum Moss

Polytrichum strictum Menzies ex Bridel 1801

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Polytrichum strictum is widespread in the boreal regions of the Holarctic, and is one of the commonest low arctic representatives of the family (D. G. Long 1985), with survivals southward in relict bogs, for example in northern Indiana, northern Illinois, and northwestern Iowa, also in alpine situations in the eastern mountains to the Carolinas and Georgia. In Nunavut, it is known from Baffin, Bathurst, and Devon islands. Its characteristic habitat is on hummocks in Sphagnum bogs, in deep masses tightly bound together by dirty-white, wooly tomentum, with short, stiffly erect leaves, and cubical capsules, a clear correlation between a distinctive morphology, distribution, and ecology.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 27: 19, 135, 138, 139, 140 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Description

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Plants slender, green to whitish green, dark brownish with age, in deep, compact tufts. Stems 6-12(-20) cm, simple, densely matted with wooly whitish to light-brownish tomentum. Leaves 2-5(-6) mm, erect to closely appressed when dry, erect-spreading when moist; sheath oblong-rectangular, brownish, ± abruptly contracted to the blade; blade narrowly lanceolate, acuminate, flat, with sharply infolded margins; marginal lamina 6-7 cells wide, 1-stratose, entire to finely crenulate above, membranous and transparent, abruptly infolded and enclosing the lamellae and overlapping towards the apex; costa toothed abaxially towards the apex, short-excurrent as a short, reddish brown awn; lamellae bluntly crenate in profile, 5-8 cells high, the marginal cells in section pyriform, thick-walled, ending in a thickened knob, end cells of lateral lamellae ovoid and scarcely thickened at the apex; sheath cells 45-80 × 7-10 µm, elongate-rectangular (5-7:1), narrower toward the margin; cells of the marginal lamina transversely elongate, shorter and obliquely oriented towards the margins, very thick-walled and colorless. Sexual condition dioicous; perichaetial leaves somewhat longer than the stem leaves, ending in a slender awn. Seta 2-4 cm, yellowish to reddish brown. Capsule 2-3 mm, short-rectangular to almost cubic (1-1.5:1), brownish, sharply 4-angled and prismatic, suberect, becoming horizontal when ripe; peristome 200-230 µm, divided to 0.8, the teeth 64, obtuse. Calyptra dirty white to light brown, enclosing the capsule. Spores 7-9(-15) µm.
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 27: 19, 135, 138, 139, 140 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
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Synonym

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Polytrichum affine Funck; P. juniperinum var. affine (Funck) Bridel; P. juniperinum var. gracilius Wahlenberg
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 27: 19, 135, 138, 139, 140 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
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eFloras

Polytrichum strictum

provided by wikipedia EN

Polytrichum strictum, commonly known as bog haircap moss[1] or strict haircap,[2] is an evergreen and perennial species of moss native to Sphagnum bogs and other moist habitats in temperate climates. It has a circumboreal distribution, and is also found in South America and Antarctica.[3]

Description

Like other species in the Polytrichaceae, Polytrichum strictum has leaves with a single costa, vertical lamellae, a water-repelling cuticle, and rhizoids that appear to facilitate external water movement in addition to anchoring the plant.[4] Dense tufts of slender stems from 6–12 cm form 20–40 cm hummocks in bogs and similar substrates.[2][3] Leaves are narrowly lanceolate, appressed to the stem when dry and spreading to erect when moist.[3] The reddish awn (formed by the slightly excurrent costa) and smooth, inrolled leaf margins separate P. strictum from other Polytrichum species; only juniper haircap moss (P. juniperinum) shares these attributes.[2] P. strictum, however, can be easily distinguished by the wooly-tomentose white rhizoids that extend up its stems (absent in P. juniperinum), as well as its boggy habitat and predilection for organic soils (in contrast to the weedy nature and preference for mineral soils that characterize P. juniperinum).[2][5]

Distribution

Polytrichum strictum is found throughout Canada, the northern half of the United States, Greenland, Iceland, the Faroe Islands, northern Europe and Asia, as well as Antarctica and the southern half of South America.[1][3] It is characteristic of boggy peatland habitats dominated by Sphagnum mosses, but can also be found in wet heaths, tundra, sedge meadows, and peaty forests from low to high elevations; in warmer climates, it is largely confined to relict bogs.[3] Its microhabitat is at the top of peat hummocks, which it often helps to form.[3]

Reproduction

The male reproductive structures of P. strictum, featuring splash cups.
Immature sporophytes of P. strictum, with calyptra clearly visible.

Polytrichum strictum is dioicous,[3] with male and female reproductive structures produced separately by male and female gametophytes, which are haploid (1n). As in other Polytrichum species, the antheridia are borne terminally on male plants and swell and burst when mature, launching sperm into the air; in addition, they develop in splash cups, which further facilitate sperm dispersal by catching and harnessing the energy of rain drops.[4] The lucky few sperm to land near the archegonia of a female plant (also borne terminally) use their two whiplash flagella to swim down the neck and into the venter, where one will fertilize the ovum. Once fertilisation takes place, the zygote develops into the diploid (2n) sporophyte, which consists of a foot (embedded in the tissue of the gametophyte), a seta (or stalk), and a capsule.[4] The capsule, which is covered by a dirty-white calyptra, matures after the seta elongates, at which point the calyptra is shed.[3][4] Within the capsule, each sporoctye undergoes meiosis to produce four haploid (1n) spores; when these are mature, the operculum is projected and the spores are released through the peristome, which is joined by the epiphragm and ringed by 64 nematodontous teeth.[3][4] When the proper conditions and substrate are available, the spores germinate into a filamentous protonema, from which the gametophytes emerge, completing the cycle.

Use in restoration

P. strictum leaf cross section, showing lamellae, costa, and inrolled leaf margin

Polytrichum strictum is considered an important pioneer species in peatlands, able to tolerate a wide range of environmental conditions and disturbance regimes.[6] It is instrumental in preventing frost heaving in harvested peatlands, and research suggests it can be used in the restoration of unstable peat areas, although little is known about whether it aids or hinders Sphagnum growth.[7]

References

  1. ^ a b "Polytrichum strictum - Polytrichum strictum - Overview - Encyclopedia of Life". Encyclopedia of Life. Retrieved 2017-05-07.
  2. ^ a b c d Atherton, I., Bosanquet, S.,& Lawley, M. (2010). Mosses and Liverworts of Britain and Ireland - A Field Guide. Plymouth, UK: British Bryological Society. p. 326. ISBN 9780956131010.{{cite book}}: CS1 maint: multiple names: authors list (link)
  3. ^ a b c d e f g h i "Polytrichum strictum in Flora of North America @ efloras.org". www.efloras.org. Retrieved 2017-05-07.
  4. ^ a b c d e Glime, Janice (2007). "Bryophyte Ecology, Volume 1: Physical Ecology". Bryophyte Ecology. Retrieved May 7, 2017.
  5. ^ Pojar, J., & Mackinnon, A. (2004). Plants of Coastal British Columbia. Vancouver, BC: Lone Pine. p. 452. ISBN 1551055325.{{cite book}}: CS1 maint: multiple names: authors list (link)
  6. ^ Sobze, J.M., Gauthier, M.E., Xu, B., & Schoonmaker, A. (November 2013). "Peatland Site Revegetation" (PDF). Boreal Research Institute. Retrieved May 7, 2017.{{cite web}}: CS1 maint: multiple names: authors list (link)
  7. ^ Groeneveld, E.V.G., & Rochefort, L. (March 2005). "Polytrichum strictum as a Solution to Frost Heaving in Disturbed Ecosystems: A Case Study with Milled Peatlands" (PDF). Restoration Ecology. 13 (1): 74–82. doi:10.1111/j.1526-100x.2005.00009.x. S2CID 56332150.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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Polytrichum strictum: Brief Summary

provided by wikipedia EN

Polytrichum strictum, commonly known as bog haircap moss or strict haircap, is an evergreen and perennial species of moss native to Sphagnum bogs and other moist habitats in temperate climates. It has a circumboreal distribution, and is also found in South America and Antarctica.

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Wikipedia authors and editors
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