Macrohyporia extensa and its synonym Poria cocos

Daedalea extensa Peck is an earlier name for Poria cocos Wolf, the fungus commonly called tuckahoe. Descriptions of the basidiomes and cultures are presented. In the northern deciduous forests of eastern North America the fungus typically occurs as a trunk and butt rot of mature, old-growth trees. The basidiomes appear after the tree has died. Reports of the fungus from Manitoba, Saskatchewan, and Alberta require confirmation because of confusion with the Canadian tuckahoe, Polyporus tuberaster Fr. Both D. extensa and Merulius sulphureus Burt are transferred to Macrohyporia.