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Page number:269 
Remarks (public):Ganoderma applanatum is easy to recognize in the field and often used as the "artist's fungus" because drawings can be made on the fresh pore surface with a sharp instrument. The bruised tissue undergoes an immediate oxidation and turns brown permanently. The tubes are often attacked by larvae of the dipteran Agathoma wankowici which induces growth around the point of attack so the pore surface is more or less covered by rounded mounds with a central hole through which the adult insect ultimately escapes. Specimens should be disinfected rapidly as they frequently harbour numerous beetles. 
Description type:Non-original description 
Description:Ganoderma applanatum (Pers.) Pat. - Soc. Mycol. France Bull. 5:67. 1889. - Boletus applanatus Pers., Obs. Mycol. 2:2. 1799. - Polyporus applanatus (Pers.) Walk., Flora Crypt. Germ. 4:591, 1833. Basidiocarps perennial. sessile, woody to corky. applanate, rarely ungulate; pileus surface crustose. grayish to black or brown, usually covered with a layer of chocolate-brown spores. appearing dusty. irregular to tuberculate. margin thin, white; pore surface creamy white on fresh specimens, quickly bruising brown when handled, becoming dull buff with age, pores circular, 4-6 per mm; context purplish brown. usually mottled with whitish streaks and patches. corky; tube layers concolorous with context, separated by a layer of context tissue, each layer up to 13.5 mm thick. Hyphal system trimitic; contextual generative hyphae inconspicuous, thin-walled, with clamps. 2-5 µm in diam; contextual skeletal hyphae thick-walled, brown, nonseptate, 3-6.5 µm in diam, occasionally branched, the extremities tapering to acute apices; binding hyphae few; upper crust consisting of randomly oriented, branched arboriform skeletal hyphae in a dense, agglutinated dark brown matrix making them difficult to separate.
Cystidia and other sterile hymenial elements lacking.
Basidia broadly clavate. 4-sterigmate. some tapering abruptly to a narrow base, mostly 18-25 x 8-10 µm. but occasional with elongated bases, arising from intercalary positions on the subhymenial hyphae, with a basal clamp.
Basidiospores ovoid, truncate at the distal end, with two walls connected by inter-wall pillars, brown, negative in Melzer's reagent. 6-8.5 x 4.5-6 µm.
Type of rot. White mottled root and butt rot of both living and dead hardwoods. Cultural characteristics. See Campbell 1938; Davidson et al. 1942; Nobles 1948, 1955, 1965; Stalpers 1978.
Sexuality. Heterothallic and tetrapolar (Aoshima, 1953).
Substrata. As saprophyte of dead standing trees, stumps, and logs, or fruiting at the base of living trees of numerous genera of hardwoods, such as Acer, Aesculus, Alnus, Betula, Carpinus, Celtis, Cercis, Corylus, Eleagnus, Fagus, Fraxinus, Juglans, Malus, Morus, Pyrus, Prunus, Sambucus, Quercus, Salix, Sophora, Sorbus, Tilia, more rarely on Abies and Picea. For a list of other exotic hosts in Europe. see Kotlaba 1984:56.
Distribution. Common throughout Europe. north to Trondheim in Norway. Uppsala in Sweden and along the southern coast of Finland. Circumboreal species, but its exact southern limit is unknown.
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