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Page number:457 
Remarks (public):Perenniporia medulla-panis is characterized by the thick walled, variably dextrinoid spores and variably dextrinoid, rather thin and flexuous skeletal and binding hyphae. Macroscopically, the tough, perennial or persistent basidiocarps with the highly variable, but normally isabelline to cork coloured pore surface are distinctive. Reflexed basidiocarps are occasionally found on vertical surfaces such as the sides of stumps. 
Description type:Non-original description 
Description:Perenniporia medulla-panis (Jacq.:Fr.) Donk, Persoonia 5:76., 1967. - Boletus medulla-panis Jacq., Miscel. Austr. 1:141, 1778. - Polyporus medulla-panis Jacq.: Fr., Syst. Mycol. 1:380, 1821.
Basidiocarps annual to perennial, becoming widely effused, usually resupinate but sometimes narrowly reflexed on vertical surfaces, tough-corky; pore surface highly variable in colour, cinereous, cream colour to cream-buff or bright yellow, the pores circular, 4-7 per mm, with thick dissepiments; subiculum thin, cream coloured to yellowish; tube layers concolorous with subiculum, distinctly stratified, each layer up to 1 mm thick.
Hyphal system trimitic; subicular generative hyphae thin-walled, nodose-septate, 2-4 µm in diam; subicular skeletal hyphae thick-walled, nonseptate, 1-3 µm in diam; binding hyphae thick-walled, nonseptate, much-branched, 1.5-2 µm in diam; skeletal and binding hyphae variably dextrinoid in Melzer's reagent; tramal hyphae similar.
Cystidia none; fusoid cystidioles present, not projecting, 15-22 x 5-7 µm with a basal clamp: hyphal pegs present.
Basidia broadly clavate with a narrow base, 4-sterigmate, 16-27 x 7-11 µm, with a basal clamp.
Basidiospores broadly ellipsoid to ovoid, usually truncate, thick-walled, smooth, hyaline, weakly to strongly dextrinoid in Melzer's reagent, 5-6 x 3.5-4.5 µm.
Type of rot. White rot of dead hardwoods; positive in gum guaiac solution. Cultural characteristics. See Stalpers 1978; Flott and Gilbertson 1991. Sexuality. Heterothallic and tetrapolar (Flott and Gilbertson 1991).
Substrata. On dead hardwoods like Adenocarpus, Alnus, Betula, Castanea, Corylus, Cratageus, Cytisus, Echinopartum, Erica, Eucalyptus, Fagus, Fraxinus, Hypericum, Pistacia, Prunus, Robinia, Quercus, Tilia and Viburnum. once also collected on Cupressus. In North America and the tropics on numerous other hosts.
Distribution. Widely distributed in Europe north to the limit of the Quercus range; cosmopolitan species.
 
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