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Page number:145 
Remarks (public):The characteristic cracking and the lemon to pale sulphurous colour are good field characteristics. Old and faded specimens without cracking may be recognized by the weak amyloid reaction of the skeletal hyphae and the allantoid spores. From the similarly coloured A. alpina, it is separated by smaller pores, more cylindric, allantoid spores, and the lack of a purplish red colouration in KOH. 
Description type:Non-original description 
Description:Antrodia xantha (Fr.:Fr.) Ryv. Fig. 58 - Norw. J. Bot. 20:8, 1973. - Polyporus xanthus Fr.:Fr., Syst. Mycol. 1:379, 1821. - Polyporus calceus(Fr.)Schw., Trans. Am. Philos. Soc. 4N. ser. p. 159, 1832. - Polyporus vulgaris Fr. var. calceus, Syst. Mycol. 1:381. 1821.
Basidiocarps annual. resupinate, often widely effused, up to 5 mm thick, or as numerous rounded pilei or nodulose knobs on a more or less vertical substrate (f. pachymeres J. Erikss.), adnate, soft when fresh, crumbly and chalky when dry, bitter in taste, margin narrow and white; pore surface citric to sulphurous yellow to cream when fresh, fading on drying and storing to almost pure white or pale cream, smooth when young, when older characteristically cracking into square pieces 5-15 mm long and wide, pores circular. 5-7 per mm; subiculum thin and white, chalky: tube layer pale yellowish cream to white, up to 3 mm thick.
Hyphal system dimitic; generative hyphae with clamps, thin-walled, hyaline. 2-4 µm in diam; skeletal hyphae predominant, semisolid. straight to slightly sinuous, nonseptate, unbranched to occasionally dichotomously branched, 3-6 µm in diam. weakly amyloid.
but reaction variable and most easily seen in hyphal masses and in fresh condition. Cystidia none, but fusoid, inconspicuous, non-projecting cystidioles occur scattered among the basidia. 10-14 x 3-4 tun, with a basal clamp.
Basidia clavate, 4-sterigmate, 10-15 x 4-6 µm. with a basal clamp.
Basidiospores allantoid, hyaline, smooth, thin-walled, negative in Melzer's reagent, 4-5 x 1-1.5 µm.
Type of rot. Causes a brown cubical rot.
Cultural characteristics. See Nobles 1948. 1965: Lombard and Gilbertson 1965; Stalpers 1978.
Sexuality. Unknown.
Substrata. Usually on conifers, especially Pinus and Larix, more rarely on Abies and Picea. It seems to prefer sunny and dry localities and commonly it occurs on decorticated wood or charred logs. Occasionally it grows on angiosperms, especially on Salix sp. in boreal and continental areas.
Distribution. Common and circumglobal in the conifer zone. In Europe seemingly following the coniferous forest wherever it occurs naturally.
 
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