Mystery fungus with 'teeth' on upper surface

Mystery fungus with 'teeth' on upper surface

Observation - Mystery fungus with 'teeth' on upper surface - UK and Ireland. Description: Largest caps were 2,5 -3 cm across. Notable translucent tooth like structures on upper surface of caps, which seemed to be sooth on lower surface. Some were encrusting rather than forming caps Growing on unidentified dead branch (not Silver Birch).

Largest caps were 2,5 -3 cm across.
Notable translucent tooth like structures on upper surface of caps, which seemed to be sooth on lower surface.
Some were encrusting rather than forming caps
Growing on unidentified dead branch (not Silver Birch).