Mushrooms are the fleshy fruiting bodies of a fungus, which bear spores for reproduction. Includes mushrooms with a stem and cap as well as any fruiting body, such as truffles or jelly fungus.

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What are these brown, cap-shaped mushrooms on my birch tree?

I live in Massachusetts and have several birch trees in my yard. One of them has brown, cap-shaped mushrooms growing in groups up and down the trunk. As you can see, the tree has a big crack in the ...