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Page number:273 
Remarks (public):The species belongs in the difficult G. lucidum complex but is separated from G. lucidum s. str. by having a more robust basidiocarp. a blackish pilear surface, paler context, wider spores that appear distinctly "rough" under the light and scanning microscopes, and a preference for conifers.
Unfortunately, no cultural data is available for G. carnosum. In North America the very similar conifer inhabiting G. tsugae and G. oregonense are clearly distinguishable from the hardwood-inhabiting G. lucidum by their relatively low optimum growth temperature (20-25°) and lack of chlamydospores (Adaskaveg & Gilbertson 1986).
 
Description type:Non-original description 
Description:Ganoderma carnosum Pat. - Bull. Soc. Mycol. Fr. 5:66, 1889 - Ganoderma atkinsonii Jahn, Kotlaba and Pouzar, Westf. Pilzbr. 11:98, 1980.
Basidiocarps annual, laterally to rarely eccentrically stipitate, dimidiate, orbicular to reniform. single or imbricate. 3-18 x 5-22 x 14 cm. coriaceous to corky; upper surface glabrous. shiny and laccate when young. slightly duller when old, irregular to undulating or radially furrowed, occasionally with sulcate zones, vinaceous brown to almost black, actively growing margin white and rounded, later yellowish and with a transitional reddish zone to the darker parts of the upper surface; pore surface cream to ivory white in actively growing specimens, becoming ochraceous brown when old, pores round to angular, 3-4 per mm; stipe when present laccate and concolorous with the pileus. 1-10 cm long, 0.7-4 cm in diam and of variable and irregular thickness; context of stipe and pileus whitish to cream,becoming pale hazel brown, soft and fibrillose, up to 3.5 cm thick; tube layer up to 2.5 cm thick, pale brown to cocoa, not decurrent on the stipe and usually separated from the stipe by a groove.
Hyphal system trimitic in context. dimitic in dissepiments; generative hyphae hyaline, thin-walled, with clamps, 3-6 µm in diam; skeletal hyphae dominating in context and trama, thick-walled to solid. hyaline to slightly pigmented, unbranched or with a few terminal branches, 5-7 µm in diam; binding hyphae rare to common in the context. thick-walled, with tapering whip-like side branches; surface crust composed of a palisade of claviform hyphal ends, also known as pileocystidia, these pale brown, thick-walled to almost solid, with strongly amyloid inner walls. 7-11 µm in diam, arising from clamps which may be difficult to observe, up to 75 µm from clamp to apex, apical parts covered with a resinous substance responsible for the laccate surface.
Cystidia or other sterile hymenial elements absent.
Basidia ovoid to barrel-shaped, 18-25 x 10-12 µm, 4-sterigmate, with a basal clamp. Basidiospores ellipsoid, truncate at the apex. pale brown, with a thick dark inner wall and a hyaline, very thin exospore separated by interwall pillars, appearing rough under light microscope. negative in Melzer's reagent. 10-13 x 7-8 (-8.5) µm; the rough appearance of the basidiospores of this species and G. valesiacum is caused by more pronounced depressions over the points of attachment of the interwall pillars to the relatively thin exospore. This has clearly been shown by Adaskaveg & Gilbertson (1986) with G. tsugae.
Type of rot. White rot of conifers, rarely on hardwoods.
Cultural characteristics and sexuality. Unknown.
Substrata. Usually conifers, especially Abies, but also found on Taxus. Larix, Picea. Pinus and Pseudotsuga; rarely on hardwoods including Betula, Carpinus, Fagus and Quercus.
Distribution. South-central European species. known from England. through Central Europe to the Carpathian mountains in Ukraine. scattered in the Mediterranean and the Pyrenean Mts. (type locality for G. carnosum). For a map of distribution, see Jahn et al. op. cit. p. 119. The northernmost localities are in southern Denmark and Estonia.
 
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