16 January 2011 Hampshire. Photograph copyright Leif Goodwin.
Irregular, thin, whitish, pale yellow then brown with age, to about 2mm thick
On old Piptoporus betulinus brackets
Ascospores sub-spherical to ovoid (4-5) x (3-4) µm2. Asci cylindrical, 16 spored.
The name derives from the pulvinate (cushion shaped) form