A medicinal fungus or mushroom-like growth found on birch trees, used in traditional medicine as a tea or supplement.
From Russian 'чага' (chaga), likely derived from Finnish or other Uralic languages where birch forests are common and the fungus was traditionally harvested. The term entered English through Slavic and Russian medical and ethnobotanical traditions.
Chaga mushroom is one of the hottest wellness trends now, but Siberian and Russian peasants have used it for centuries—it's a black crusty growth on birch trees that, when brewed, becomes a medicinal tea with earthy, subtle flavors.
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