Oak polypore (Piptoporus quercinus)

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Oak polypore
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Oak polypore fact file

Oak polypore description

KingdomFungi
PhylumBasidiomycota
ClassBasidiomycetes
OrderPoriales
FamilyCoriolaceae
GenusPiptoporus (7)

This fungus causes a brown rot of the heartwood of mature or dead oak trees. The stemless bracket-like fruit bodies (the visible part of the fungus) have a smooth upper surface, which feels velvety when young (6). As the fruit body matures, pores develop on the underside (6), and the colour changes from white to pale-yellow and then brown with a white border in mature specimens (6).

Synonyms
Buglossoporus pulvinus, Buglossoporus quercinus.
Size
Width: 19 cm (6)
Thickness: up to 5 cm (6)
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Oak polypore biology

Fungi are neither plants nor animals but belong to their own kingdom. They are unable to produce their own food through the process of photosynthesis, as plants do; instead, they acquire nutrients from living or dead plants, animals, or other fungi, as animals do. In many larger fungi (lichens excepted) the only visible parts are the fruit bodies, which arise from a largely unseen network of threads called ‘hyphae’. These hyphae permeate the fungus’s food source, which may be soil, leaf litter, rotten wood, dung, and so on, depending on the species.

In the oak polypore, the hyphae occur within the heartwood of living or dead trees (6). The oak polypore is one of the few species able to live in oak heartwood, which contains a number of toxic or antifungal compounds (6). The fruit bodies of this species occur in July or August, either singly or in clusters, and persist for just a few weeks (6). Old fruit bodies, however, can sometimes persist into the following year in a blackened, decaying or mummified state (6).

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Oak polypore range

This species is widespread but rare in Europe, and the range extends as far east as Japan. It is currently in decline in central Europe and has already become extinct in many areas of northern Europe. In Britain, the species is only known in England, where it has been recorded from 22 sites, ten of them (from Sussex north to Yorkshire) since 1970 (6).

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

This fungus occurs on the limbs and trunks of living or dead veteran oak trees (i.e. trees which are 250 - 800 years old), or on fallen heartwood (6). Typical habitats include medieval forests, deer parks, wood pasture and wooded commons (6).

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Oak polypore status

Provisionally classified as Endangered in Great Britain, and fully protected in the UK under Schedule 8 of the Wildlife and Countryside Act 1981 (1).

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Oak polypore threats

In many woodlands, the age structure of the trees has become skewed towards old specimens, and very little regeneration of new trees occurs. This threatens the long-term future survival of the oak polypore, as there may come a time when oaks of a suitable age will not be present. Felling of old and dead oak trees, often for reasons of 'tidiness' or 'health and safety', has also affected the species, as has clearance of fallen wood (1).

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Oak polypore conservation

The oak polypore fungus is a UK Biodiversity Action Plan (UK BAP) priority species, and is included in English Nature's Species Recovery Programme. The Species Action Plan for this fungus aims to maintain all known populations, and establish five new colonies by 2010 from ex-situ cultivated stocks. In areas where the species exists, pollarding oaks and protecting saplings will help to ensure a supply of suitably aged oaks in the future. In addition, current host trees, dead or alive, must not (and cannot legally) be destroyed, nor can fallen host dead wood be cleared (1). Sherwood Forest (one of the known sites for the fungus) is a Site of Special Scientific Interest, and a candidate Special Area of Conservation (4). Furthermore, the species is one of just four non-lichenized fungi to be protected by law; Schedule 8 of the Wildlife and Countryside Act deems that it is an offence to pick, uproot, cut, destroy, collect or sell any listed species (5).

There may be further information about this species available via the National Biodiversity Network Gateway.
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Find out more

For further information on the conservation of British fungi, see:

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Authentication

Information authenticated by Carl Borges of English Nature:
http://www.english-nature.org.uk/ and by Dr Peter Roberts of Royal Botanic Gardens, Kew:
http://www.rbgkew.org.uk/

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Glossary

Ex-situ
Measures to conserve a species or habitat that occur outside of the natural range of the species. E.g. in zoos or botanical gardens.
Fruit body
In fungi, the fruit body is the visible part of the fungus which bears spores (microscopic particles involved in both dispersal and reproduction).
Photosynthesis
Metabolic process characteristic of plants in which carbon dioxide is broken down, using energy from sunlight absorbed by the green pigment chlorophyll. Organic compounds are made and oxygen is given off as a by-product.
Pollarding
A tree that has had its limbs and larger branches removed, leaving a trunk that grows new poles each year. The process is often carried out to avoid the dropping of dangerous branches in urban environments, but is also carried out to prolong the life of a tree.
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References

  1. National Biodiversity Network Species Dictionary (November, 2001)
    http://www.nhm.ac.uk/nbn/
  2. Roberts, P. (2001) Report on the oak polypore Piptoporus quercinus (syn. Buglossoporus quercinus; B. pulvinus), A UK BAP priority species and Schedule 8 species. English Nature Research Report Number 458. English Nature, Peterborough.
  3. Jordan, M. (1995) The Encyclopaedia of fungi of Britain and Europe. Harper Collins Publishers, London.
  4. Sherwood Forest (November, 2001)
    http://www.robinhood.co.uk/themes/forest/natural2.htm
  5. Marren, P. (2001) Waxcaps and woodland mushrooms. Conservation of fungi in Britain and Northern Europe. Plant Talk On-line (November, 2001)
    http://www.kak75.dial.pipex.com/Pages/26fungi.html
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Image credit

Oak polypore  
Oak polypore

© John Poland

John Poland
91 Ethelburt Avenue
Swaythling
Southampton
Hants
SO16 3DF
United Kingdom
jpp197@alumni.soton.ac.uk

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