This is what was subsumed under Phlebia livida earlier. The genuine Phlebia livida exclusively grows on coniferous wood whereas all (?) finds on hardwood must be referred to this originally described as Phlebia livida spp. tuberculata. Its characteristic bluish leadish hue makes it easy to determine in the field once you have experience with Corticiaceae. Also it is always a bit tuberculate as the epitheton suggests.