• Proposed
  • Under Assessment
  • Preliminary Assessed
  • LCAssessed
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Dichomitus efibulatus A.M. Ainsw. & Ryvarden

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Scientific name
Dichomitus efibulatus
Author
A.M. Ainsw. & Ryvarden
Common names
 
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Polyporales
Family
Polyporaceae
Assessment status
Assessed
Preliminary Category
LC
Proposed by
Martyn Ainsworth
Assessors
Martyn Ainsworth
Reviewers
Anders Dahlberg

Assessment Status Notes

Justification

This wood-inhabiting poroid fungus forms resupinate or slightly reflexed basidiomata on small dead branches of shrubs and on stems of some woody herbs.
It grows in Prunus-dominated scrub habitats with strong Atlantic influence. First recorded in 2004, described in 2008 and with a worldwide distribution that is still almost restricted to those parts of Britain exposed to the strongest Atlantic climatic influence (the extreme SW and near the S coast of England and on the island of Anglesey in N. Wales). There is also one collection in K from the Channel Isles (Guernsey). This species is suspected to be present along the Atlantic coast of N. France (and perhaps Ireland, N. Spain and Portugal), nevertheless the global range is still expected to be very restricted. Around 200 mature individuals are known from Britain and Guernsey.  The total number of British mature individuals could be 10 times greater than currently known and if the species is shown to be present elsewhere in W. Europe, then the total could be 40 times greater. No current threats to habitat and no other evidence of decline. It is assessed as Least Concern (LC).


Taxonomic notes

Now recombined as Polyporus efibulatus (A.M. Ainsw. & Ryvarden) Melo & Ryvarden, Syn. Fung. (Oslo) 37: 353 (2017)


Why suggested for a Global Red List Assessment?


Geographic range

Recorded in 176 localities (= fruiting individuals) in England & Wales exposed to the strongest Atlantic climatic influence and one locality in Guernsey (Channel Islands). 94% of these localities were recorded by one person (Ken Preston-Mafham) in Cornwall. This species favours sites with a strong Atlantic influence and it is also expected to occur in Ireland, N. France and possibly N. Spain and Portugal although very few people are searching for resupinate polypores. The global range is expected to be very restricted.


Population and Trends

From observations of inhabited deadwood and the mycelial territories delimited therein, this species seems to be present as a single mature individual per fruiting patch. Such patches are relatively short (usually <15cm) and so fruiting patches can be taken as representing mature individuals. Around 200 mature individuals are known from Britain and Guernsey. This species favours sites with a strong Atlantic influence and it is also expected to occur in Ireland, N. France and possibly N. Spain and Portugal although very few people are searching for resupinate polypores. The total number of British mature individuals could be 10 times greater than currently known and if the species is shown to be present elsewhere in W. Europe, then the total could be 40 times greater. No current threats to habitat and no other evidence of decline.

Population Trend: Stable


Habitat and Ecology

It is a white-rot saprotroph of small diameter dead branches (usually attached) of various shrubs and stems of some woody herbs, perhaps most frequently found in Atlantic coastal thickets of Corylus and Rosaceae (Prunus spinosa, Rosa, Rubus) and widespread across Cornwall. It has been recorded on Acer, Carpinus, Chamerion, Corylus, Crataegus, Fagus, Forsythia, Fraxinus, Hedera, Ilex, Malus, Pinus, Prunus, Rosa, Rubus, Salix, Ulex. Around the coastal localities, the fungus favours Prunus-dominated scrub habitat such as occurs along the long-distance coastal footpaths,  but in the extreme SW of England (Cornwall) it seems to occur on dead attached twigs of many woody plants.


Threats

No major threats in short term


Conservation Actions


Research needed


Use and Trade


Bibliography

Ainsworth, A.M. (2009) Dichomitus efibulatus: a recently described polypore from S.W. Britain. Field Mycology 10(2): 59-62
A.M. Ainsworth, L. Ryvarden (2008). Dichomitus efibulatus nova species. Synopsis Fungorum, 25: 48-52
Henrici, A. (2018). Notes and records. Field Mycology 19(1): 31-33
Lost & Found Fungi Project. https://fusiontables.google.com/data?docid=163sStL35b1Pt-p5zTvpGzEkwfdPiBMkp2GhOexfM#map:id=3
Melo, I. & Ryvarden, L. (2017). Synopsis Fungorum 37: 353


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted