Petalophyllum ralfsii, the petalwort,[1] is a liverwort of the orderFossombroniales.[2] It is a small green bryophyte that occurs in the Mediterranean region as far east as Turkey, and along the Atlantic coast of Europe as far as northwest Scotland.[3] It grows primarily on moist sand dunes.[4]
The plants are small, typically less than 15 mm long by 10 mm wide (0.6 in by 0.4 in), and thallose; that is, the plant is not differentiated into root, stem, and leaf. The thallus consists of a midrib flanked by two wings that bear erect, leaf-like lamellae on their dorsal surface.[4][5]
Distribution and habitatedit
Petalophyllum ralfsii has a widespread distribution across Europe, primarily in the Mediterranean region. It has a specific habitat requirement, being restricted to dune slacks with certain features; it needs open, damp conditions, often growing on low hummocks rather than on the wettest parts of the slack. In Britain, the largest population occurs at Achnahaird in Scotland, the most northerly point in its range. Other locations include Braunton Burrows and Dawlish Warren in Devon; Kenfig, Aberffraw and the Carmarthen Bay dunes in Wales; Lindisfarne off the coast of Northumberland; the Isles of Scilly and the Sefton Coast in Merseyside. These dunes are increasingly under threat, leading to the species being classified as "vulnerable", and the British Isles may now be the liverwort's stronghold.[4]
It sometimes grows beside paths, where trampling feet keep down competing vegetation. Plants with which this liverwort may be associated include various mosses, grasses such as the common bent (Agrostis capillaris), red fescue (Festuca rubra) and Yorkshire-fog (Holcus lanatus), the grey sedge (Carex flacca) and the buck’s-horn plantain (Plantago coronopus).[4]
Referencesedit
^Edwards, Sean R. (2012). English Names for British Bryophytes. British Bryological Society Special Volume. Vol. 5 (4 ed.). Wootton, Northampton: British Bryological Society. ISBN978-0-9561310-2-7. ISSN 0268-8034.
^Crandall-Stotler, B.J., Stotler, R.E. and Long, D.G. 2009. Phylogeny and classification of the Marchantiophyta. Edinburgh Journal of Botany, vo. 66, no. 1, p. 155-198.
^Rumsey, F.J., Vogel, J.C. and Russell, S.J. 2001. A study of genetic variation in the threatened hepatic Petalophyllum ralfsii (Wils.) Nees and Gottsche (Fossombroniaceae). Conservation Genetics, vol. 2, no. 3, p. 271-277.
^Crandall-Stotler, B.J. 2017. "Bryophyte Flora of North America, Provisional Publication, Petalophyllaceae". Missouri Botanical Garden. Retrieved 4 September 2017.{{cite web}}: CS1 maint: numeric names: authors list (link)
May 03, 2024
petalophyllum, ralfsii, petalwort, liverwort, order, fossombroniales, small, green, bryophyte, that, occurs, mediterranean, region, east, turkey, along, atlantic, coast, europe, northwest, scotland, grows, primarily, moist, sand, dunes, scientific, classificat. Petalophyllum ralfsii the petalwort 1 is a liverwort of the order Fossombroniales 2 It is a small green bryophyte that occurs in the Mediterranean region as far east as Turkey and along the Atlantic coast of Europe as far as northwest Scotland 3 It grows primarily on moist sand dunes 4 Petalophyllum ralfsii Scientific classification Kingdom Plantae Division Marchantiophyta Class Jungermanniopsida Order Fossombroniales Family Petalophyllaceae Genus Petalophyllum Species P ralfsii Binomial name Petalophyllum ralfsii Wilson Nees amp Gottsche ex Lehmann 1844Description editThe plants are small typically less than 15 mm long by 10 mm wide 0 6 in by 0 4 in and thallose that is the plant is not differentiated into root stem and leaf The thallus consists of a midrib flanked by two wings that bear erect leaf like lamellae on their dorsal surface 4 5 Distribution and habitat editPetalophyllum ralfsii has a widespread distribution across Europe primarily in the Mediterranean region It has a specific habitat requirement being restricted to dune slacks with certain features it needs open damp conditions often growing on low hummocks rather than on the wettest parts of the slack In Britain the largest population occurs at Achnahaird in Scotland the most northerly point in its range Other locations include Braunton Burrows and Dawlish Warren in Devon Kenfig Aberffraw and the Carmarthen Bay dunes in Wales Lindisfarne off the coast of Northumberland the Isles of Scilly and the Sefton Coast in Merseyside These dunes are increasingly under threat leading to the species being classified as vulnerable and the British Isles may now be the liverwort s stronghold 4 It sometimes grows beside paths where trampling feet keep down competing vegetation Plants with which this liverwort may be associated include various mosses grasses such as the common bent Agrostis capillaris red fescue Festuca rubra and Yorkshire fog Holcus lanatus the grey sedge Carex flacca and the buck s horn plantain Plantago coronopus 4 References edit Edwards Sean R 2012 English Names for British Bryophytes British Bryological Society Special Volume Vol 5 4 ed Wootton Northampton British Bryological Society ISBN 978 0 9561310 2 7 ISSN 0268 8034 Crandall Stotler B J Stotler R E and Long D G 2009 Phylogeny and classification of the Marchantiophyta Edinburgh Journal of Botany vo 66 no 1 p 155 198 Rumsey F J Vogel J C and Russell S J 2001 A study of genetic variation in the threatened hepatic Petalophyllum ralfsii Wils Nees and Gottsche Fossombroniaceae Conservation Genetics vol 2 no 3 p 271 277 a b c d 1395 Petalwort Petaolphyllum ralfsii Joint Nature Conservation Committee U K Retrieved 4 September 2017 Crandall Stotler B J 2017 Bryophyte Flora of North America Provisional Publication Petalophyllaceae Missouri Botanical Garden Retrieved 4 September 2017 a href Template Cite web html title Template Cite web cite web a CS1 maint numeric names authors list link Retrieved from https en wikipedia org w index php title Petalophyllum ralfsii amp oldid 1032533125, wikipedia, wiki, book, books, library,
