Growth/ fungi?

Growth/ fungi?

Observation - Growth/ fungi? - UK and Ireland. Description: This fungi/ growth was on a rotted out, decaying tree. The growth felt hard to touch and seemed to cover the majority of the trunk. Does anyone know what this growth/ fungi is? Is it some sort of stress response?

This fungi/ growth was on a rotted out, decaying tree. The growth felt hard to touch and seemed to cover the majority of the trunk. It also had a grey web-like coating over the top of the growths. Does anyone know what this growth/ fungi is? Is it some sort of stress response?