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Remarks (public):For a complete description including images see www.cababstractsplus.org/dfb 
Remarks (internal):The name G. lucidum has been misapplied in many cases, especially in the tropics, and the literature can be misleading. Ganoderma tsugae and G. mongolicum do not differ from G. lucidum and G. carnosum is only distinguished by the slower rate of saponification by KOH of the melanoid substances in the carpophore. The type specimen of G. valesiacum has been largely destroyed by insects but remains of the cutis are identical to the hymenodermiform anatomy of that of G. lucidum. All collections of G. valesiacum from Switzerland correspond in all respects to G. Iucidum except that they have smaller spores. Little investigation of the pathogenicity of the fungus has been done but positive results are reported from seedling inoculations of Liquidambar styracifolia and Acacia julibrissin (46, 1108) in USA,. of Elaeis guineensis in Malaysia (42, 480) and Acer spp. in the USA (37, 378). More frequently a soft white butt rot is caused which may result in windthrow. Sporophores are generally formed at the base of the stem at very late stages of disease, after the host has died. Serious losses of Khair (Acacia catechu) are reported from India (48, 1328) where thorough eradication of stump residues from sites before planting is advocated for control. Losses to Dalbergia sissoo on heavy soils in India have also occured (36, 432).
 
Description type:Non-original description 
Description:Ganoderma lucidum (W. Curtis: Fr.) P. Karst., Rev. mycol. 3: 17, 1881.
= Boletus lucidus W. Curtis, Flora londinensis f. 4, pl. 224, 1781 (typus iconog.).
= Polyporus lucidus Fr.. Syst. Mycol. 1: 353, 1821.
= Polyporus laccatus (Tim.) Pers., Myc. Europ. 1: 54, 1825.
= Polyporus japonicus Fr., Epicr.: 442. 1836.
= Ganoderma valesiacum Boud., Bull. Soc. mycol. Fr. 11: 28, 1895.
= Ganoderma tsugae Murrill, Bull. Torrey bot. Cl. 29: 601, 1902.
= Ganoderma mongolicum Pilat, Annls mycol. 38: 78. 1940.
Basidiocarp (basidioma) annual, sessile to long mesopode or pleuropode depending on which substratum it is produced, either tree bole or buried wood, generally thick, up to 20 mm, sometimes more or less tumid when sessile, pileus subplane to very irregular, up to 160 mm across; stipe up to 100-120 mm long, 10-30 mm thick; upper surface and stipe shiny, lacquered, blackish-brown, irregularly humped; margin and pore surface white when growing, tawny with age. Cutis thin, a fraction of 1 mm, context from russet near the tube layer to white for the major part; context varies according to latitude from white (Scandinavia) to tawny (Portugal and central African mountains) with concentnc lines of various shades; tubes monolayered, up to 15 mm long, russet, concolorous with lower part of context. Cutis of hymenioderm type composed of anticline inflated extremities of hyaline context, hyphae swollen by melanoid substances leaving usually a central lumen; the melanoid substances are easily saponifed by KOH; inflations clavate, up to 50 µm long, 8-10 µm wide near apex. Skeletal Hyphae brown in the coloured parts of the context, nearly hyaline or hyaline close to cutis, 3-4 µm wide, sparsely ramified, subparallel to intertwining, specially in the less coloured parts of the context, no binding hyphae. Pores circular to irregular, 100-430 (av. 210) µm diam., with dissepiments usually relatively thin, 10-320 (av. 52) µm thick; distance between axes of pores ± 260 µm. Basidiospores ovoid, double-walled, epispore thin, ovoid, hyaline; endospore thick, ovoid, with usually a small part of the apex more or less Date brown or shades of brown, bearing relatively few long and thick echinules that support the epispore, sometimes fused into a short crest, in freshly discharged spores the apex of the epispore remains swollen and bulging, the tip of the apex soon collapses leaving an ovoid spore with a truncated tip, 8-13 (av. 10,6) x 5,5-9 (av. 6,9) µm; occasionally smooth, mono-walled, spores can be observed, brown, 8,5-10 (av. 9,3) x 6-7,5 (av. 6,5) µm; gasterospores are very rarely observed (only one basidium from Portugal) in the context, navicular, pale brown, with a very thick deposit on the walls, 16-34 (av. 22) x 9-14 (av. 10,3) µm.
Hosts: Angiosperms and Gymnosperms: Quercus sp., Quercus Ilex, Ligustrum vulgare, Carpinus betulus, Fagus
sylvatica, Corylus avellana, Populus alba, Prunus insititia, Picea sp., Taxus sp., Larix sp., Abies sp.
Disease: Butt rot and lethal root disease of many tree species.
Geographical distribution: Throughout the temperate zones of the northern hemisphere. From the Pacific shores
of the USA and Canada, through temperate Europe to the Pacific shores of Asia and Japan. Also in the mountains of Central Africa above the 1500 m level.
Physiological specialization: None reported.
Literature: Kavina & Pilat, Atlas des champignons de l'Europe III: 481-484, 1942; Steyaert, Persoonia 7: 93-95, 1971.


 
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