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Page number:133 
Remarks (public):The effused, large basidiocarps and the host specificity make this a distinct species in the field. Undoubtedly, it is closely related toA. crassa by its distinct crumbly white context and the fairly large ellipsoid spores. A. crassa is known only from conifers. 
Description type:Non-original description 
Description:Antrodia pulvinascens (Pilát) Niemelä - Karstenia 20:37,1980. - Poria pulvinascens Pilát, Sbom. Nar. M us. Praha 9B:106, 1953. - Antrodia plicata Niemelä. Karstenia 18:44, 1978.
Basidiocarps resupinate to more rarely nodulose. perennial, widely effused, cushion shaped when mature and then up to 1 cm thick, corky, when nodulose with sloping sterile parts, these glabrous and slightly furrowed to striate, at first wood coloured, then ochraceous to unevenly dirty brown, margin narrow, white and cottony; pore surface smooth to slightly undulating, pale cream when fresh. straw-to wood coloured when dry, pores circular, usually 4-5 per mm, on sloping substrates peripheral pores often split and larger, angular to sinuous, up to 2 per mm; tube layers concolorous, up to 10 mm thick in old specimens. slightly stratified. oldest tube layers and context crumbly to chalky, changing to an amorphous mass without definite structure.
Hyphal system dimitic; generative hyphae with clamps, 2-3.5 µm in diam; skeletal hyphae thick-walled to solid, 2-4 (5) µm in diam. unbranched and straight to slightly undulating, negative in Melzer's reagent.
Cystidia none, but scattered fusoid cystidioles present. 16-24 x 5-6 µm. with a basal clamp.
Basidia clavate, 4-sterigmate, 19-27 x 5-7 µm, with a basal clamp.
Basidiospores ellipsoid and slightly bent towards the apiculus. hyaline, smooth, negative in Melzer's reagent, 6.0-7.5 x 2.5-3.2 µm.
Type of rot. Causes an intense brown rot in dead Populus and Salix.
Cultural characteristics. See Niemelä 1978.
Sexuality. Unknown.
Substrata. In Scandinavia known only from Populus tremula: in Central Europe and Spain also on Salix sp.
Distribution. Rather rare, but locally common, in continental parts of the Fennoscandian peninsula, recorded also from Russia, Switzerland. Poland. Austria, Czechoslovakia. Germany, Yugoslavia and the Pyrenean mountains in Spain.
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