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 Add this item to the list  GANODERMA COLOSSUS (Fr.) Baker.
Page number:89 
Description type:Non-original description 
Description:GANODERMA COLOSSUS (Fr.) Baker.
V. Cent. Fungi Malay. no 425, 1918. - Polyporus colossus Fr. Nova Acta Soc. Sci. Upsal. III 1:56, 1851 (UPS!). - Ganoderma obockenese Pat. Bull. Soc. Mycol. Fr. 3:119, 1887 (PC'). - Polyporus hollandii Mass. Bull. misc. Inf. Kew 1901, p. 163 (K;).
FRUITBODY perennial, sessile, often of irregular shape, semicircular to elongated, somewhat ungulate, up to 25 cm wide and long, up to 10 cm thick, soft when fresh, light of weight and context cheesy in consistency when dry. PILEUS glabrous, semiglossy to dull, yellow to pale brown, cuticle present, cracks up under drying and is often destroyed, easily-dented and scraped with a nail, margin of lighter colour than the basal part. PORE SURFACE white to cream when fresh, ochraceous to pale brown when dry, pores 3-4 per mm, quite thick-walled, tubes concolorous with pore surface, pale brown, up to 3 cm deep. CONTEXT soft and punky when fresh, cheesy to chalky and easily crumbled with a nail, white, cream of pale ochraceous.
HYPHAL SYSTEM di-trimitic, generative hyphae hyaline, thin-walled and with clamps, 3-5 ? wide, clamps often large and conspicuous, in the subhymenium the hyphae are moderately branched, in the context partly intertwined in dense clusters with very short cells and strong branching, it is these dense masses of generative hyphae that give the context its characteristic consistency so different from the other Ganoderma sp, skeletal hyphae pale yellow to hyaline, solid, 2-4(5) ? wide, richly present in the context and randomly oriented in context not gelatinized in 2.5% KOH, in the trama hyaline, agglutinated and mixed with parallel generative hyphae and here the skeletals become partly gelatized in KOH. CYSTIDIOLS present as hyphal end or partly ventricose hyaline organs, up to 30 µm long, difficult to find unless the specimen has been properly dried. SPORES echinulate, truncate to ovoid, yellow 14-19 x 8-12 µm.
HABITAT. On angiosperms of many kinds. DISTRIBUTION. Pantropical, but not seen from East Africa. Specimens have been examined from Zaire, Cameroon's, Nigeria, Senegal and Ghana. Thus, it may be that it is restricted to the wetter lowland rain-forests.
REMARKS. The species is easy to recognize because of the pale and chalky context with a thin yellow crust.

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