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Page number:222 
Remarks (public):D. quercina is usually easy to recognize because of the even pale colour, the very hard basidiocarps, and the irregular daedaleoid hymenophore. Amtrodia jumiperima, a similar species restricted to junipers is perhaps the most similar morphologically and is also a brown rot fungus. 
Description type:Non-original description 
Description:Daedalea quercina L.:Fr. - Syst. Mycol. 1:333, 1821. - Agaricus quercinus L. Spec. Plant. p. 1176, 1753. - Daedalea quercina (L.) Pers. Syn. Meth. Fung. p. 500, 1801.
Basidiocarps perennial, single or with a few pilei fused laterally, broadly sessile to dimidiato, semicircular, up to 20 cm wide. 15 cm broad and 8 cm thick, strongly attached to the substrate, corky to woody and hard; upper surface of pileus flat to slightly convex, often with a slightly raised base, smooth to finely velutinate, in some specimens with tufts of raised hyphae or scattered nodulae or warts, the base rougher or more scrupose than the margin which is usually smooth; margin ochraceous. inner parts deeper brownish to grayish in old specimens, sometimes with pads or smaller areas with fresh outgrowth of light ochraceous mycelium. acute; pore surface flat to oblique, especially close to the substrate. ochraceous, hymenophore irregular, along the margin elongated-poroid in the inner parts with sinuous pores or daedaleoid to labyrinthine or almost lamellate, on oblique parts the pores are deeply split in front, mostly 1-4 mm wide measured tangentially, walls 1-3 mm thick; context up to 1 cm thick, ochraceous to tobacco brown, with indistinct annual zones; tubes up to 4 cm long, light ochraceous on the inner tube walls while the trama is distinctly darker.
Hyphal system trimitic; generative hyphae thin-walled, hyaline, with clamps. 1.5-4 µm in diam; binding hyphae tortuous with short branches, thick-walled to solid, light golden yellowish brown; skeletal hyphae dominating, thick-walled to solid, light brown, 3-6 µm in diam.
Cystidia none, but skeletal hyphae bend into the hymenium as a dense catahymenium with cystidia-like. rounded and thick-walled apices. often with a fine granular exudate;, some skeletal hyphae slightly swollen and pointed at the apex. strikingly similar to true hymenial cystidia unless followed into the vertical trama where they originate.
Basidia very difficult to find even if fresh specimens are examined, occurring singly between the projecting skeletal hyphae, clavate, 20-27 x 6-7.5 µm, 4-sterigmate, with a basal clamp.
Basidiospores cylindrical, hyaline. thin-walled, smooth, negative in Melzer's reagent. 5.5-6 x 2.5-3.5 µm. difficult to find in most specimens as the periods of sporulation seem to be short and the basidia collapse rapidly on drying.
Type of rot. Causes a brown rot in the heartwood of living trees and eventually results in large hollows in the host; also continues decay in stumps.
Cultural characteristics. See Davidson et al. 1942; Nobles 1948, 1965; Stalpers 1978. Sexuality. Heterothallic and bipolar.
Substrata. In the North Europe growing exclusively on Quercus, often fruiting on very hard wood. In Central and Southem Europe also noted on other hosts such as Acer, Castanea, Corylus, Eucalyptus, Fagus, Fraxinus, Juglans, Populus, Prunus, Sorbus, Tilia and Ulmus.
Distribution. Follows Quercus species everywhere in Europe. For a range map of Quercus petraea, the oak with the widest distribution in Europe. Circumglobal and throughout Asia, North Africa and Europe in the range of oaks. In eastern Asia it is replaced by Daedalea dickinsii (Berk.) Aoshima which is similar and may be a form of D. quercina. It is separated by smaller and more regular pores.
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