The paper thin flowerheads of last year's Hyndrangea catches the light. Bracket fungi on the branch of a fallen tree near the edge of the lake.
I saw this growing on an old Birch. The following pic is of the same fungi taken from a lower angle to the right & you can see the underside & gills in better detail.
Hoof fungus, Fomes fomentarius, tough as old boots.
The trunk of this birch is covered in golden brown, capped fungi. The gills are more visible in the next shot
And some other sightings.