| 词条 | Petalophyllum ralfsii |
| 释义 |
| image = | image_caption = | regnum = Plantae | divisio = Marchantiophyta | classis = Jungermanniopsida | ordo = Fossombroniales | familia = Petalophyllaceae | genus = Petalophyllum | species = P. ralfsii | binomial = Petalophyllum ralfsii | binomial_authority = (Wilson) Nees & Gottsche ex Lehmann, 1844 }}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] 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] References1. ^{{cite book|last=Edwards|first=Sean R.|date=2012|title=English Names for British Bryophytes|location=Wootton, Northampton|publisher=British Bryological Society|isbn=978-0-9561310-2-7|issn=0268-8034|series=British Bryological Society Special Volume|volume=5|edition=4}} {{Taxonbar|from=Q7171645}}2. ^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. 3. ^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. 4. ^1 {{cite web|title=1395 Petalwort, "Petaolphyllum ralfsii"|url=http://jncc.defra.gov.uk/protectedsites/sacselection/species.asp?FeatureIntCode=S1395|publisher=Joint Nature Conservation Committee, U.K.|accessdate=4 September 2017}} 5. ^{{cite web|last1=Crandall-Stotler|first1=B.J. 2017.|title=Bryophyte Flora of North America, Provisional Publication, Petalophyllaceae|url=http://www.mobot.org/plantscience/BFNA/bfnamenu.htm|publisher=Missouri Botanical Garden|accessdate=4 September 2017}} 2 : Fossombroniales|Endangered species of the British Isles |
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