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Page number:45 
Remarks (public):The species is easy to recognize because of its pale and chalky context with a thin, yellow cuticle. 
Description type:Non-original description 
Description:Ganoderma colossum (Fr.) C.F. Baker, V. Cent. Fungi Malay. no 425, 1918. - Polyporus colossus Fr., Nova Acta Soc. Sci. Upsal. III 1:56, 1851 - Ganoderma obockenese Pat., Bull. Soc. Mycol. Fr. 3:119, 1887 - Polyporus hollandii Massee, Bull. Misc. Inf. Kew 1901:163, 1901.
Basidiocarps annual, sessile, often of irregular shape, semicircular to elongated, somewhat ungulate, up to 50 cm long, 25 cm wide and 10 cm thick, soft when fresh, lightweight and crumbly when dry; pilear surface yellow to pale brown, glabrous, semiglossy to dull, with a laccate cuticle that cracks under drying and is easily crushed with a fingernail, margin lighter than the base; pore surface white to cream when fresh, ochraceous to pale brown when dry, pores 3-4 per mm, with thick dissepiments, tubes pale vinous brown, up to 3 cm long; context soft and spongy when fresh, cheesy to chalky when dry, cream to pale buff, up to 8 cm thick.
Hyphal system amphimitic; generative hyphae with clamps, hyaline, thin-walled, 3-5 µm wide, clamps often large and conspicuous, in the trama moderately branched, in the context partly intertwined in dense clusters with very short cells and strong branching, these dense masses of generative hyphae give the context its characteristic consistency so different from other Ganoderma species; arboriform hyphae hyaline and agglutinated in the trama, weakly amyloid, becoming partly gelatinized in KOH, pale yellow to hyaline in the context, solid, 2-6 µm wide, randomly oriented and not gelatinized in KOH; cuticle as a palisade of thin-walled, clavate hyphae, 32-75 x 7.5-12 µm. Chlamydospores scattered in the context and trama, reddish brown in KOH, globose, thick-walled, 18-23 wide, with a coarse reticulum and blunt projections up to 4 µm long and 2 µm wide.
Basidia subglobose, 20-30 x 13-17 µm, with four sterigmata.
Basidiospores echinulate, truncate to ovoid, yellow, 14-19 x 8-12 µm.
Substrate. On hardwoods of many kinds.
Distribution. Pantropical, but rare. In East Asia known from subtropical Japan (Okinawa).
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