Polytrichum piliferum
Polytrichum piliferum | |
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Scientific classification | |
Kingdom: | Plantae |
Division: | Bryophyta |
Class: | Polytrichopsida |
Order: | Polytrichales |
Family: | Polytrichaceae |
Genus: | Polytrichum |
Species: | P. piliferum
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Binomial name | |
Polytrichum piliferum Hedw.
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Synonyms[1] | |
Synonyms
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Polytrichum piliferum, the bristly haircap, is an evergreen perennial species of moss in the family Polytrichaceae.[2] The bristly haircap moss is small-sized to medium-sized and forms loose tufts[3] with wine-reddish stems.[4] It is an acrocarpous moss that appears bluish-green to grey.[5] This moss grows in clumps on erect shoots and becomes a red-brown colour as it grows older.[6] The most distinguishing feature of P. piliferum is the long, white awn at the tips of the leaves, which also give this moss its grey colour.[5] It is the only species in its genus where the awn is completely hyaline.[6]
Common names
In English the species goes by the common names polytrichum moss, bristly haircap,[7] or bristly haircap moss. In Finnish its common name is karvakarhunsammal, while in German it is called Glashaar-Frauenhaarmoos, Glashaar-Haarmützenmoos, Glashaar-Widertonmoos, Haartragendes Frauenhaar-Moos, or Haartragendes Frauenhaarmoos.[2]
Distribution
Polytrichum piliferum has a bipolar, cosmopolitan distribution, occurring in suitable habitats on all continents[2][8] including Antarctica.[9]: 39 P. piliferum is less common than Polytrichum juniperinum[7] and it often occurs in association with species of Cladonia.[3] In sandy dry grass lands the species prevents higher plants from growing.[10]
Habitat
It is found in similar habitats to Polytrichum juniperinum,[7] however, P. piliferum prefers more open and exposed areas. [11]: 324 P. piliferum also prefers a drier environment [6] and is able to withstand temperatures as high as 90°C to 100°C.[12] P. piliferum can also be frequently found in areas that are acidic and low in nutrients, therefore, they can be an excellent gauge for nutrient levels. [5]
The habitat of P. piliferum includes shallow soil over outcrops, exposed sandy soils of banks, gravel cover, and disturbed areas.[5] Other habitats of P. piliferum includes rocks on road banks or pastures.[13] It is also found in shallow and drained sand or gravel, like in ground over rocks and boulders.[3]
Reproduction
P. piliferum is
Gametophytic characteristics
Overall structure
Polytrichum piliferum grows close to the ground (about 4 cm or less) and forms dense clusters near the tip of the shoot, forcing the stem to be somewhat bare.[11] The stem is tall, wiry, unbranched, and a dark-red colour.[3] The calyptra of P. piliferum is hairy and a whitish-brown color.[3]
Leaf structure
In P. piliferum, shorter leaves are located close together towards the tip of its red stems, giving the shoot a characteristic tapered shape.[7] The leaves have a distinct white, hair-like awn at the leaf tip, in contrast to the short red-brown awns of P. juniperinum. These leaves can be anywhere from 4 mm to 7 mm long,[13] although they may be shorter in dry areas.[6] The leaves of P. piliferum are costate and often stand erect, straight, and slightly in-curved when dry, and erect-spreading when moist.[3]
Polytrichum piliferum leaves possess parallel, longitudinal lamellae of photosynthetic tissue on their upper surfaces, which are a unique characteristic associated with the Polytrichopsida.[14] Another distinguishing feature of P. piliferum are the in-curved leaf blades over the photosynthetic lamellae.[15] The topmost cells of the lamellae in P. piliferum are smooth,[5] and under a microscope, the cross section of each lamella appears 1 cell wide and 5 to 7 cells high.[13]
Male gametophyte
In this species, the antheridia develop from cells below the leaves.[16] The male shoots produce a dark-red, terminal antheridia[11] that is surrounded by a cup-shaped whorl of perigonial leaves that resembles a flower.[5][3]
Sporophytic characteristics
The sporophytes of P. piliferum are common and usually reach maturity during the summer.[5] The sporangia are cube-like and inclined, but become more horizontal when mature.[3] They are borne on the red-brown seta that is approximately 1 cm to 3 cm in height.[3]
Conservation status
P. piliferum is ranked globally as secure (G5) as of 1/26/2015,[17] meaning that this species is at a very low risk of becoming globally extinct due to an abundant population.[18] In Canada, Polytrichum pilifeurm is ranked as secure (N5),[17] meaning that this species has a very low risk of becoming extinct in Canada due to a high presence in an extensive habitat.[18]
References
- ^ "Polytrichum piliferum". The Plant List. Royal Botanic Garden Kew and Missouri Botanic Garden. 2013. Retrieved 8 October 2021.
- ^ a b c "Polytrichum moss - Encyclopedia of Life". eol.org. Retrieved 2021-10-05.
- ^ a b c d e f g h i j "Polytrichum piliferum in Flora of North America @ efloras.org". www.efloras.org. Retrieved 2021-10-06.
- ^ "E-Flora BC Atlas Page". linnet.geog.ubc.ca. Retrieved 2022-04-08.
- ^ a b c d e f g "Polytrichum piliferum | Introduction to Bryophytes". Retrieved 2022-02-11.
- ^ a b c d Webmaster, David Ratz. "Frosted Haircap Moss - Montana Field Guide". fieldguide.mt.gov. Retrieved 2021-10-06.
- ^ ISBN 978-0-521-28536-0.
- .
- ISBN 85-7528-008-2.
- ISBN 978-3-319-43048-5.
- ^ ISBN 978-0-9561310-1-0.
- ISBN 978-90-04-29780-7.
- ^ ISBN 978-1-4008-4588-0.
- ^ a b "Class Polytrichopsida | Introduction to Bryophytes". Retrieved 2022-04-08.
- ^ "E-Flora BC Atlas Page". linnet.geog.ubc.ca. Retrieved 2022-04-08.
- ISBN 978-1-107-37728-8.
- ^ a b "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 2022-04-11.
- ^ a b "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 2022-04-11.
External links
- Media related to Polytrichum piliferum at Wikimedia Commons