"The Edible Polypores; Polyporus sulphureus
Happy the gourmet who chances upon one of these mammoth polypores - not only big but delicious! Polyporus sulphureus on a upright tree spreads in horizontal layers; if from a recumbent log, in concentric ruffled blooms. Resplendent when young, its colours, peach-salmon above and sulphur-yellow below, are of unparalleled brilliance: in age it may lose some of its incandescence, turning slightly olivaceous, as shown here."
In publication, Page 126: "Reflections on the Fungaloids" by B.L. Williamson, Ottawa, 1992. ISBN 1-894572-65-3