It is an appropriate estimate of unknown localities? J oxycedrus is rather widely distributed and possibly are only a few potential sites around Mediterranean visited - hence the potential pop larger. May be better to assess as NT.
A wood-inhabiting, brown-rotting, pileate annual polypore forming highly distinctive and conspicuous basidiomata on wood of Juniperus oxycedrus subsp. oxycedrus trees. Only recorded from Italy (Sardinia) at the type locality and at two sites, on Juniperus oxycedrus and Cedrus atlantica, in southern France.
Although there are only 3 small areas with fruitbodies known worldwide, there is uncertainty about the extent of its true distribution and the role of fire in relation to fruiting. The number of mature individuals is estimated not to exceed 1000. An assessment of VU (using the D-criterion) was considered but, due to the extent of J. oxycedrus which is thought to require fungal survey work, a more cautious NT was deemed to be more appropriate.
Originally collected in 1994 and described (as Antrodia squamosella) from the type locality in Italy (Sardinia, Nuoro, Supramonte di Orgosolo, Campu’e su Mudrecu) in 1996 and by 2005 it was still only known from there and from southern France (Bernicchia 2005). It is now known from two southern French sites in total: near the Lac de Saint Cassien in the Réserve de Fontdurane and in the Forêt des cèdres du Luberon (B. Rivoire in litt.).
Fruiting on dead Juniperus oxycedrus subsp. oxycedrus trunk and logs lying on the ground (at most 4-6 fruitbodies seen per year), between 1985 and 2004 (Bernicchia in litt.) at the type locality in Italy (Sardinia, Nuoro, Supramonte di Orgosolo, Campu’e su Mudrecu). The type locality is at 1,000 m altitude and was formerly in a very extensive forest destroyed by fire in 1931 (Bernicchia 2005). Juniperus regeneration has recently been observed at the site and it is expected that fruiting is still occurring on the same few burnt logs (Bernicchia in litt.). French collections were made on J. oxycedrus in 1997 and 2000 in burnt garrigue in the Réserve de Fontdurane in an area of ca. 100 m2 and on one Cedrus atlantica tree in 2002 (by Bernard Rivoire & Max Pieri) although no further searches have been made (Rivoire in litt.).
It is estimated that fewer than 50 occupied trees are currently known although clearly not all suitable habitat has been searched.
Population Trend: Uncertain
Causing a brown rot in Juniperus and Cedrus wood. Recorded fruiting on Juniperus oxycedrus subsp. oxycedrus trees in Italy (Sardinia) in a forest (ca. 1,000 m a.s.l.) that was destroyed by fire in 1931, and, in France, on Juniperus oxycedrus in burnt garrigue and on Cedrus atlantica in a cedar forest. The role of fire in the life cycle, particularly with respect to fruiting, of this fungus requires further investigation.
Loss of old Juniperus oxycedrus trees, for example by removal for firewood or to make items such as sheepfolds
Population genetics work required to assess genetic diversity and to test and refine assumptions made about number of genets per occupied tree. Investigate the relationship between fire and fruiting of this species.
Bernicchia A. 2005. Polyporaceae s.l. Fungi Europaei 10. Edizioni Candusso, Alassio.
Ryvarden L. & Melo I. 2014. Poroid Fungi of Europe. Synopsis Fungorum, Oslo.