• Proposed
  • Under Assessment
  • LCPreliminary Assessed
  • 4Assessed
  • 5Published

Dichomitus efibulatus A.M. Ainsw. & Ryvarden

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Scientific name
Dichomitus efibulatus
A.M. Ainsw. & Ryvarden
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Preliminary Assessed
Preliminary Category
Proposed by
Martyn Ainsworth
Martyn Ainsworth
Comments etc.
Anders Dahlberg

Assessment Status Notes


Recorded in 176 localities (=mature individuals) in England & Wales 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 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.  LC is the assessment

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?

A resupinate or slightly reflexed polypore first recorded in 2004, described in 2008 and with a worldwide distribution that is still apparently 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 still 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 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 and is likely to be widespread throughout the county.

Geographic range

Apparently restricted to those parts of England and Wales exposed to the strongest Atlantic climatic influence and the Channel Isles (Guernsey).

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.

Population Trend: Stable

Habitat and Ecology

White-rot saprotroph of small diam 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.


No major threats in short term

Conservation Actions

Research needed

Use and Trade


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