This wood-inhabiting poroid fungus forms resupinate or slightly reflexed basidiomata on small dead branches of trees and shrubs and on stems of some woody herbs.
It was originally discovered in Prunus-dominated, UK coastal scrub habitats with strong Atlantic influence. First recorded in 2004 and originally described in 2008, it has a worldwide distribution that still shows a stronghold in 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) and two records documented from Asturias, N. Spain. This species is suspected to be present along the Atlantic coast of N. France (and perhaps also of Ireland and Portugal), nevertheless the global range is still expected to be very restricted. Around 200 mature individuals are known from Britain, Guernsey and Spain. The total number of 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).
Now recombined as Polyporus efibulatus (A.M. Ainsw. & Ryvarden) Melo & Ryvarden, Syn. Fung. (Oslo) 37: 353 (2017)
Recorded in 176 localities (= fruiting individuals) in England & Wales exposed to the strongest Atlantic climatic, influence, one locality in Guernsey (Channel Islands) and two sites in northern Spain. 94% of the British 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 Portugal, although very few people are searching for resupinate polypores. The global range is expected to be very restricted.
Spanish sites to be added to map:
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, Guernsey and Spain. This species favours sites with a strong Atlantic influence and it is also expected to occur in Ireland, N. France and possibly Portugal, although very few people are searching for resupinate polypores. The total number of 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
It is a white-rot saprotroph of small diameter dead branches (usually attached) of various trees, 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 in UK. It has been recorded on Acer, Carpinus, Chamerion, Corylus, Crataegus, Fagus, Forsythia, Fraxinus, Hedera, Ilex, Malus, Pinus, Prunus, Quercus, Rosa, Rubus, Salix, Ulex and Vitis. Around the UK coastal localities, the fungus favours Prunus-dominated scrub habitat such as occurs along the long-distance coastal footpaths, but elsewhere it seems to occur on dead, usually attached, twigs of many woody plants.
No major threats in short term
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
Rubio, E. http://www.centrodeestudiosmicologicosasturianos.org/?p=14969