Violet crystalwort (Riccia huebeneriana)

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Violet crystalwort
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Violet crystalwort fact file

Violet crystalwort description

KingdomPlantae
PhylumHepatophyta
ClassHepatopsida
OrderMarchantiales
FamilyRicciaceae
GenusRiccia (1)

Violet crystalwort is a small, flat greenish liverwort, which often has a violet or reddish tinge (2). Old parts of this narrow liverwort look 'spongy' (2).

Size
Diameter of rosettes: up to 1 cm (2)
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Violet crystalwort biology

Liverworts, hornworts and mosses form a group of simple plants called bryophytes (2). Bryophytes lack many of the more complex structures of the higher plants, such as a vascular system, and flowers. They do not have roots, instead they have structures called 'rhizoids' which absorb water and anchor the plant to the substrate. In liverworts these rhizoids each consist of a single elongated cell (4).

Bryophytes have an interesting life cycle, which consists of two main stages, called the gametophyte and sporophyte generations, the gametophyte generation is dominant. (4). Violet crystalwort produces sporophytes towards the end of summer and into autumn, it has very large spores, and is therefore a poor disperser; spores persist in the mud until conditions become suitable for growth (2).

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Violet crystalwort range

This liverwort has been recorded from 23 sites in Britain, since 1970, however, it has been found in just 8 sites (2). At present it hangs on at just two reservoirs in East Sussex, and a new population was found in 2001 in South Devon (3). Elsewhere, this liverwort occurs in Europe, where it is classified as Rare, and in eastern Asia (3).

You can view distribution information for this species at the National Biodiversity Network Gateway.
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Violet crystalwort habitat

Grows on exposed non-calcareous mud around ponds, lakes and reservoirs (3).

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Violet crystalwort status

Classified as Vulnerable in Great Britain (2).

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Violet crystalwort threats

This species is vulnerable to the artificial maintenance of high water levels throughout summer and autumn, for example for fishing interests (2). Nitrate and phosphate pollution may also pose problems, but this is yet to be proven (2). One of the populations in southern England is seriously threatened by the invasive alien plant, New Zealand pygmy weed (Crassula helmsii) (3).

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Violet crystalwort conservation

Violet crystalwort is a priority species under the UK Biodiversity Action Plan (UK BAP), and a Species Action Plan has been produced to guide the conservation of this liverwort (5). Plantlife, the wild plant conservation charity, has included this species in its Back From the Brink Programme, and has funded research and survey work on the species (3). Water levels should be lowered during summer and autumn at all sites supporting violet crystalwort (3).

There may be further information about this species available via the National Biodiversity Network Gateway.
The UK Biodiversity Action Plan for this species is available at UK BAP.
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Find out more

For more on Plantlife see:
http://www.plantlife.org.uk

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Authentication

Information authenticated by Plantlife, the wild plant conservation charity:
http://www.plantlife.org.uk

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Glossary

Calcareous
Containing free calcium carbonate, chalky.
Gametophyte
A life cycle stage in plants, which has one set of chromosomes (threads of DNA protein) in the cell nucleus (a condition known as ‘haploid’), which arises from a spore (which is also haploid). Sex cells (gametes) are produced during the gametophyte stage. This is the dominant life-cycle stage in liverworts and mosses.
Invasive alien
Species introduced deliberately or unintentionally outside their natural habitats where they have the ability to establish themselves, invade, outcompete natives and take over the new environments.
Rhizoids
Thread-like structures that help to anchor the plant to the substrate, and absorb minerals and water. In liverworts they consist of a single cell, in mosses they are multi-cellular.
Spores
Microscopic particles involved in both dispersal and reproduction. They comprise a single or group of unspecialised cells and do not contain an embryo, as do seeds.
Sporophyte
The stage of a plant life cycle that produces spores (microscopic particles used in dispersal and reproduction). This stage is diploid (in the cell nucleus there are two sets of chromosomes - threads of DNA protein) and is dominant in ‘higher’ plants such as flowering plants.
Vascular system
In plants, the system that allows water and nutrients to move around.
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References

  1. National Biodiversity Network Species Dictionary (May 2002) http://www.nhm.ac.uk/nbn/
  2. Church, J. M., Hodgetts, N. G., Preston, C. D. and Stewart, N. F. (2001) British Red Data Books: mosses and liverworts. Joint Nature Conservation Committee, Peterborough.
  3. Holyoak, D. T. (2002) Violet crystalwort (Riccia huebeneriana) and beaked beardless moss (Weissia rostellata): report to Plantlife on work carried out in southern England during 2001. Plantlife report number 198. ISBN 1 87261369 1.
  4. Mosses and Liverworts in Wales (May 2002): http://home.clara.net/adhale/bryos/
  5. UK Biodiversity Action Plan, Species Action Plan (September 2002): http://www.ukbap.org.uk
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Image credit

Violet crystalwort  
Violet crystalwort

© Alan Hale

Alan Hale
alan.hale@btclick.com

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