Chaga is a parasite of trees, invading the host through a wound. It causes decay of the heartwood and will persist for 10–80 years (or more), producing usually 1–3 sclerotia on the main stem and branches of the tree (Lee at al. 2008). Whereas the sclerotium is perennial, the actual fruiting body occurs only once in the infection cycle and appears as a crust-like layers of pores. The fruiting body is produced on or near the sclerotium after the host or some portion of the host dies. Chaga is connected to the host tree, when the host dies, so does the chaga fungus.
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