Growth at Tree Base- Dead Man’s Fingers

I’m curious as to what is growing at the base of my tree and whether or not I should do anything about it. There are a number of nodules just below the grass line and are attached to the tree…

Willow Tree

The tree in our yard lost 2 large limbs in recent wind storms and the limbs and the exposed heart or centre of the trunk were hollow! Some say all willows are hollow and this is why they loose limbs…