Basidiocarps of T. ochracea are usually much paler in colour than those of T. versicolor, less strongly zonate, and they lack the black layer seen in the upper context of the latter species. T. pubescens basidiocarps may also be similar but have an azonate or very faintly zonate upper surface.
Basidiocarps annual or reviving, sessile oreffused-reflexed, pilei dimidiate to elongated, tough-fibrous; upper surface finely tomentose to almost glabrous, vinaceous-buff to avellaneous with zones of reddish brown (ferruginous) or pale buff with faint darker zones; pore surface cream coloured to cinereous, the pores circular, 3-4 per mm, with thick dissepiments; context cream coloured, tough-fibrous, azonate, up to 5 mm thick; tube layer concolorous and continuous with the context, up to 4 mm thick.
Hyphal system trimitic; contextual generative hyphae thin-walled, hyaline, with clamps, 2-3.5 µm in diam; contextual skeletal hyphae thick-walled, hyaline, nonseptate, 4-8 µm in diam; binding hyphae thick-walled, nonseptate, much branched, 2.5-5 µm in diam; tramal hyphae similar.
Cystidia or other sterile hymenial elements lacking.
Basidia clavate, 4-sterigmate, 12-15 × 5-6 µm, with a basal clamp.
Basidiospores cylindric, slightly curved, smooth, negative in Melzer’s reagent, 6-7 × 2-2.5 µm.
Type of rot. White rot of dead hardwoods.
Cultural characteristics. See Nobles 1948. 1958, 1960; Stalpers 1978.
Sexuality. Heterothallic and tetrapolar (Vandendries and Brodie 1933; Nobles 1965).
Substrata. Dead wood of numerous genera of hardwoods and in Fennoscandia most common on Betula, but also collected on Acer, Aesculus, Alnus, Betula, Corylus,
Cratageus, Eucalyptus, Fagus, Fraxinus, Malus, Populus, Prunus, Pyrus, Quercus, Salix, Sorbus, Tilia and Ulmus, rarely on conifers like Picea and Pinus.
Distribution. Widely distributed in Europe and north to the North Cape area of Norway. Circumpolar species.