fruiting body_surface_rugose
wrinkled
Some specimens have from base or point of attachment a red to dark purplish or even black cuticle or coating spreading towards the margin, usually concentrically red coating usually more radially wrinkled than the underlying pileus surface, however, can be radially striate, red coating can be of varying size from almost completely covering the pileus to only a dark zone or lacking in the same collection
Polyporus tenuis
Hexagonia tenuis