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Page number:656 
Remarks (internal):The species is easy to recognize by the flat white basidiocarp with radially elongated pores, not present in any other species described here. The preference for Fagus is absolute in the northern part of its area of distribution, less so in southern Europe. 
Description type:Non-original description 
Description:Trametes gibbosa (Pers.) Fr. Fig. 354-55 Epicr. Mycol. p. 492, 1838. - Daedalea gibbosa Pers., Syn. Fung. p.501, 1801. Basidiocarps annual, pileate, applanate, sessile to dimidiate, usually semicircular in outline, up to 15 cm wide and long, 1-4 cm thick at the base, tough and coriaceous; upper surface at first tomentose to glabrous, usually in zones, with age becoming glabrous, at first white, then cream to ochraceous or discoloured pale brown to olivaceous in spots and isolated areas, often greenish at the base due to algae; margin sharp; pore surface white to pale cream or straw-coloured in old specimens, pores distinctly radially elongated, angular with entire dissepiments, in parts splitting up with age and becoming partly sinuous, labyrinthine to lamellate, 1-2 per mm measured tangentially, 1-5 mm long measured radially; context white, dense, tough-fibrous, azonate, up to 3 cm thick at the base; tube layer concolorous with pore surface, up to 2 cm thick.
Hyphal system trimitic; generative hyphae with clamps, hyaline, thin-walled, branched, 2-4 µm in diam; skeletal hyphae thick-walled to subsolid, nonseptate, hyaline, 4-9 µm
in diam; binding hyphae tortuous, thick-walled to solid, hyaline, 2-4 µm in diam; in some cases it is difficult to interpret the vegetative hyphae as intermediate forms exist between binding and skeletal hyphae.
Cystidia absent; fusoid cystidioles present, 13-19 x 4-5 µm .
Basidia clavate, 4-sterigmate, 14-18 x 3-5 µm, with a basal clamp.
Basidiospores cylindrical to oblong ellipsoid, hyaline, smooth, negative in Melzer's reagent, 4-5 x 2-2.5 µm.
Type of rot. White rot of Fagus spp, rarely in other hardwoods.
Cultural characteristics. See Stalpers 1978.
Sexuality. Heterothallic and tetrapolar (Stalpers 1978).
Substrata. Most common on dead wood of Fagus, but also recorded from other hardwoods including Acer, Aesculus, Ailanthus, Alnus, Betula, Castanea, Corylus, Cratageus, Eucalyptus, Fraxinus, Juglans, Malus, Morus, Platanus, Populus, Prunus, Pyrus, Rhainnus, Quercus, Salix, Sorbus, Tilia and Ulmus. Once recorded on Picea (Czechoslovakia).
Distribution. Follows the beech in Europe north to the southern part of Norway and Sweden (see fig. 19). Widespread through Asia to Japan. Not known from America.
 
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