Fructifications: resupinate to semipileate, tightly attached to the substrate, forming patches of sveral cm in extent, cups are 1-3 cm across and 0,5-1,5 cm projecting from the substrate, tuberculate, smooth to appressed fine tomentose, creamy to light brown, margin is obtuse.
Hymenium: porose, young whitish, then pale brown to sand colored, pores are angular to sometimes elongated, some tube mouths are toothed slit, margin of the resupinate part is distinctly bounded to sometimes fringed.
Sporée déposée: white-hyaline
Spores: cylindirc elliptic, 7-9,5 x 2,5-3,5 μm
Chair: corky, soft, if dry hard, without odor and taste
Habitat: on dead wood of broadleaved trees such as aspen, gray alder and mountain ash, also on apple, grows from fall to spring.
Remarques: causes carbonizing rots