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Large (bigger than my fist) mushroom found in Rocky Mountain National Park.
Montane.
When these are young, you can eat them! Great in spaghetti I am told after cleaning and sauteed...
I think this is a mature Spiny Puffball. The spines slough off in age, revealing a somewhat net-like or reticulated surface. In young they are white, but as the puffball ages, it turns brown and the flesh turn powdery. Matures develop a hole at the top through which spores are released.