Description
Fruit-body annual, fan- to shell-shaped. Cap 0.5-2 x 0.5-1.5 cm, 1-3 mm thick. Upper surface occasionally faint concentrically zoned, smooth, translucent pale cream to yellowish, with thin, undulate margin.
Tubes up to 1 mm long, whitish. Pores 5-7 per mm, circular to angular, cream. Flesh thin, very tough (to the bite), whitish to cream.
Spore-print colour white.
Occurrence
Fairly common on branches and trunks of deciduous trees (Willow, Birch).
Saprophyte.
Related and/or similar species
The crust-like Antrodiella romellii.