Growing at the base of a living oak tree. 20 March 2022 Hursley, Hampshire. Photograph copyright Leif Goodwin.
Kidney shaped, laterally attached to the substrate by a cylindrical stem, upper surface concentrically ridged, shiny, orange, reddish brown or almost black, underside cream, ochraceous with age, 4 to 5 pores per mm, to about 30 cm across
Corky, zoned, whitish when young, darker with age
On deciduous and coniferous wood. Annual.
Spores ovoid, truncated, warty (8-11) x (6-8.5) µm2
Could be confused with G. carnosum which occurs only on wood from Abies species.
20 March 2022 Hursley, Hampshire. Photograph copyright Leif Goodwin.