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Literature:
 
Page number:72 
Remarks (public):Basidiocarps of this species are recognized by the pale lemon yellow color, crumbly consistency, and bitter taste. The tendency to break up into small angular pieces is also very characteristic. 
Description type:Non-original description 
Description:Poria xantha (Fr.) Cke., Grevillea 14: 112. 1886.
Polyporus xanthus Fr., Hym. Eur., p. 574. 1874.
Description of basidiocarps
Basidiocarps annual, extensively effused, crumbly or chalky, not readily separable; margin fertile or narrowly sterile, pale yellowish, tomentose, up to 2 mm wide; pore surface pale lemon yellow or fading to ivory when dried, often becoming cracked into angular blocks, the pores circular to angular, 5-7 per mm, with thick, entire dissepiments that split in some areas to form deep anastomosing cracks in the tube layer; context whitish to ivory, azonate, chalky, up to 3 mm thick; tube layer pale yellowish to ivory, continuous with the context, up to 3 mm thick; taste very bitter.
Context hyphae hyaline in KOH, thick-walled, rarely branched, mostly aseptate, 2-6.5 µm, in diam; tramal hyphae similar, 2-4.5 µmin diam; hymenial layer 14-16 µm, thick; basidia clavate, 11-12 x 4.5-5 µm; cystidioles abundant, imbedded, fusoid, 3-4 µm, in diam; spores hyaline, smooth, cylindrical, curved, 3.5-5 x l-1.5 µm, (Fig. 3, B).
Substratum and rot: Associated with a brown cubical rot of the slash of Larix, Picea, Pinus, Pseudotsuga, and Thuja and various coniferous and hardwood products.
 
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