Inonotus obliquus. black birch mushroom. Chaga, a fungal infection on the trunk of a birch tree. ethnoscience. Birch bark with Chaga mushroom. natural

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Inonotus obliquus. black birch mushroom. Chaga, a fungal infection on the trunk of a birch tree. ethnoscience. Birch bark with Chaga mushroom. natural medicine

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Photo credit: © Pavel Vatsura / Alamy / Afripics
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