These Trametes versicolor fungi are sometimes also called Coriolus versicolor and Polyporus versicolor.
The fungi in picture have developed sagging edges like those found on old style veranda canopies. The lower surfaces of the caps have also lost the white colour expected on a thriving specimen.
The decay affects the whole rank of old mushrooms, also the smaller ones at the ends (iNaturalist; www.mushroomexpert.com; Wikipedia).