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Hard growth on an old tree stump - what is it?!

Planning to plant a shrub border in the garden of my new house but there’s a tree stump in it. There is something on top of it which looks a bit like fungus but is rock hard. Any ideas what it is, and whether / how it needs treating before I start planting shrubs around it? Thank you 0
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It’s just a fungus ... some are hard, some are the more usual toadstool texture.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.