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  • Under Assessment
  • Preliminary Assessed
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Perenniporia medulla-panis (Jacq.) Donk

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Scientific name
Perenniporia medulla-panis
(Jacq.) Donk
Common names
Valge püsipoorik
pórnatka chlebová
Gelaagde poria
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Preliminary Category
NT A2c+3c
Proposed by
Reda Iršėnaitė
Reda Iršėnaitė
Comments etc.
A. Martyn Ainsworth, Anders Dahlberg, Daniel Dvořák, Irmgard Krisai-Greilhuber, Wim A. Ozinga, Irja Saar

Assessment Notes

R-L categories correct, but text here does not match final assessment. Updated version will be published in IUCN´s Red List June or Nov 2019.


Polypore growing on coarse old stumps, snags and logs of oak trees, rarely on other trees. It considered rare and declining in many European countries due to declining of coarse old oaks through Europe. A specific substrate such as coarse oak stumps are rather rare, declining and new formation of such substrate is long lasting. Gaps in the age structure of oaks such that there no middle age oaks in many countries threatened the survival of species. Deadwood removal from forests and cutting of old oaks is rather common practice in some countries (Lithuania, Latvia) despite the protected status of habitats such as Natura 2000. The evaluation of status in Europe could be Vulnerable (VU) or Near Threatened (NT), but the uncertainty in taxonomy and possible misidentification with other Perenniporia (P. meridionalis) lead to preliminary assessment as Data Deficient (DD).

Taxonomic notes

According to Decock & Stalpers (2006) the concept of P. medulla-panis used of e.g. Ryvarden & Gilbertson (1994) was broad and included two species in Europe. As defined by Decock & Stalpers (2006) P. medulla-panis is known only from Europe (ranging from Italy to Norway, eastward to Russia). In this assessment, we use the definition of species by Decock & Stalpers (2006).

Why suggested for a Global Red List Assessment?

Perenniporia medulla-panis is wood decay polypore fungus found on dead hardwood, especially oak (Quercus). It is widespread, but considered rare in Europe and distributed in Europe north up to the limit of the Quercus range. The species is threatened by felling of host trees and removal of coarse woody debris.

Geographic range

Its precise geographic distribution is unknown because some observations in Europe can be related to Perenniporia meridionalis. As stated by Decock & Stalpers (2006) P. medulla-panis s.s. distributed in Europe ranging from Italy to Norway, eastward to Russia. In the North, it follows the distribution range of oak (Quercus).

Population and Trends

The distribution in Europe is mainly in western and central part, thou in Scandinavia it reaches only the southern part, following the distribution of oak, the number of localities in Norway is 163 and in Sweden 150. In Sweden it considered to have decreased and continues to decrease, mainly due to impaired availability of dead oak wood of appropriate quality and densification of the species habitat. In Denmark it considered being decline > 20 % over 2 generations. In Lithuania is known from 40 localities, half of them (23) till 1990. In Austria, Switzerland, Estonia after 1990 it was lesser record than before. The 150 localities in Germany and not considered rare.
It could be estimated about 800 localities and a probable number of localities could be 5 time higher (4000) due to unknown distribution in Russia, Belarus where the range of oak distribution continue. The population size could be estimated (multiplying 5 possible genets in the locality and 2 ramets per genet) 40000 mature individuals.

Population Trend: Decreasing

Habitat and Ecology

Perenniporia medulla-panis is saprotrophic wood-inhabiting fungus growing on hardwood trees especially on Quercus, but it is also known from other trees, such as Alnus, Betula, Corylus, Fagus, Tilia, Fraxinus (Ryvarden & Gilbertson 1993). It grows on the bases of old, barren stumps, and coarse fallen trunks or on old living trees in trunk cavities in old oak forests or mixed forests with oaks. Fruit body is perennial, widely effused, resupinate, 2-20 mm thick, tough-corky. Pore surface white when fresh, later cream color, the pores small and circular. The fruit-body is not easy to spot because of its habit to grow inside cavities.

Temperate Forest


Conservation Actions

All suitable habitats for species, coarse lying oak trees, stumps, snags, should be saved untouched in and near the known species locality. For the species survival for longer time uneven age, broadleaved forests should be preserved in order to continue the supply of suitable habitat

Site/area protectionSite/area management

Research needed

Study of species taxonomy and distribution needed.

TaxonomyLife history & ecology

Use and Trade

The species is not known to be used.


Ryvarden, L., Gilbertson, R.L. 1994. European Polypores. Part 2. Synopsis Fungorum, 7: 388–743.
Stalpers, J.A., Decock C., 2006. Studies in Perenniporia: Polyporus unitus, Boletus medulla-panis, the Nomenclature of Perenniporia, Poria and Physisporus, and a Note on European Perenniporia with a Resupinate Basidiome. Taxon 55: 759-778.

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted