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Reishi (lingzhi) is the woody, kidney- to fan-shaped fruiting body of the bracket fungus Ganoderma lingzhi and its close relatives — a tough, inedibly hard polypore prized for more than two millennia in East Asian medicine and brewed as a bitter tea or decoction rather than eaten as food.
What to look for, from board-hard, dark, dry-smelling to damp, musty, bored through.