Chaga may not look like much -- it's a lumpy, charcoal-colored bulb protruding from birch trees -- but this fungus is trending.
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While this strange-looking mushroom has been called a "tree cancer" since it will eventually kill its host tree, it has attracted interest for centuries in fighting human cancer and other diseases.
Hunting season is over, there is nothing green for miles, and squash doesn't look nearly as good as it did three months ago. But there's always an obscure mushroom laying dormant out in the woods.
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