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Remarks (public):The smoky gray to black colour of the pore surface and the cream coloured pileus, often greyish along the margin, are distinctive field characters. Bjerkandera fumosa is similar and differs in having ochraceous to buff. thicker and wider basidiocarps and larger basidia and spores. 
Description type:Non-original description 
Description:Bjerkandera adusta (Willd.: Fr.) Karst. - Medd. Soc. Fauna Fl. Fenn. 5:38, 1897. - Polyporus adustus Willd.:Fr., Syst. Mycol. 1:363, 1821. - Boletus adustus Willd. Fl. Berl Prodr. p. 392, 1787. - Gloeoporus adustus (Willd.:Fr.) Pilat, Atl. Polyp. p. 157, 1937.
Basidiocarps annual, sessile, effused-reflexed, or occasionally resupinate under logs, often in imbricate clusters, tough, reflexed up to 3 cm; upper surface of pileus cream to buff, tomentose or strigose to glabrous with age, azonate or faintly zonate; pore surface gray to black, the pores angular, regular, 6-7 per mm, dissepiments thin, entire; context pale buff, azonate with distinct thin upper layer of tomentum, up to 6 mm thick; tube layer smoky gray, distinct from context, up to 1 mm thick.
Hyphal system monomitic; contextual hyphae thin- to moderately thick-walled, with abundant clamps, 3-5 µm in diam, with occasional branching; tramal hyphae similar but densely compacted and agglutinated.
Cystidia or other sterile hymenial elements lacking; dark brownish vascular hyphae sometimes present in subhymenium and in hymenial layer.
Basidia clavate to napiform, 4-sterigmate, 10-14 x 4-5 µm, with a basal clamp. Basidiospores short-cylindric, hyaline, smooth, negative in Melzer's reagent, 4.5-6 x 2.5-3.5 µm.
Type of rot. White rot of hardwood logs and slash. more rarely on
conifers, but seemingly more common on such hosts in industrial areas of Central Europe (I. Dunger pers. comm.; positive in gum guaiac solution.
Cultural characteristics. See Nobles 1948. 1958. 1965; Stalpers 1978. Sexuality. Heterothallic and bipolar (Vandendries, 1936).
Substrata. On hardwoods such as Acacia. Acer, Aesculus, Alnus, Betula, Carpinus, Corylus, Crataegus, Fagus, Fraxinus, Juglans, Malus, Platanus, Populus, Prunus, Rhamnus. Robinia. Rosa. Quercus, Salix. Sambucus, Sorbus, Syringa, Tilia and Ulmus besides more rarely on conifers like Abies, Larix, Picea and Pinus. In the tropics on numerous other hosts.
Distribution. A common and cosmopolitan species and occurs throughout Europe where there are trees.

 
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