Truncospora ohiensis
Formerly Perenniporia ohiensis. This resupinate (flat) form of
truncospora ohiensis was growing from a dead fruit tree, possibly wild
cherry or plum.  Pore surface (white) develops tiny ridges to help with
spore dispersal, extending the pores outward.  This white rot fungus
also develops caps (top-right image).
Images and description at
MushroomExpert.Com

See Macrofungi Associated with Oaks of
Eastern North America
(2008), D.E.
Binion, et al., p. 385
Truncospora ohiensis
Truncospora ohiensis
Truncospora ohiensis
Truncospora ohiensis