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Page number:435 
Remarks (public):David (1974) has by interfertility studies proved that the species is genetically isolated from O. caesius even if there are some few specimens that may be difficult to separate. 
Description type:Non-original description 
Description:Oligoporus subcaesius (David) Ryvarden & Gilb. comb. nov. Basionym: Tyromyces subcaesius David., Bull. Soc. Linn. de Lyon. 43: 120, 1974.
Basidiocarps annual, pileate to effused-reflexed, rarely more than 3 cm wide, 0.5-2 cm thick, soft and watery when fresh, easily detached from the substrate, light when dry; upper surface azonate, white to ochraceous with slight grayish to bluish tints in spots and streaks, pubescent; pore surface white to pale gray, usually not bluish when bruised, pores circular to angular, 4-5 per mm, with thin dissepiments; context white, becoming slightly greyish towards the upper surface, 3-12 mm thick; tube layer white to pale grey with age.
Hyphal system monomitic; generative hyphae hyaline, thin-walled, with clamps, 2.55 µm in diam, negative in Melzer's reagent.
Cystidia or other sterile hymenial elements absent.
Basidia clavate, 4-sterigmate, 15-25 x 4.5-6.5 µm, with a basal clamp.
Basidiospores allantoid, thin-walled, hyaline, slightly amyloid in Melzer's reagent in fresh specimens when observed in masses, the reaction disappearing with age, 4-5 x 11.2 µm.
Type of rot. Brown rot in hardwoods, rarely in conifer wood.
Cultural characteristics and Sexuality. Unknown.
Substrata. On conifers like Abies, and Picea, more commonly on different hardwoods like Acer, Alnus, Betula, Corylus, Cratageus, Fagus, Frangula, Fraxinus, Populus, Quercus, Salix, Sambucus, Sorbus, Tilia and Ulmus.
Distribution. Widespread in Europe. Because of confusion with O. caesius it is difficult to ascertain its distribution in Asia and North America.
 
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