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Just as the author writes in his article I must also echo the concern of eating wild mushrooms. Never eat any mushroom unless you are an expert or are with an expert at identification. This takes a serious understanding. Eating poisonous mushrooms will make you very sick and could even kill you. Its not a game. That said, mushrooms are one of my favorite foods of all. Their ability to make fire is also incredible valuable as well.
You will find a few graphics on the various mushroom types in this article. These will help you identify which mushrooms will help you start fire. There are also mushrooms that hold heat and an ember for a long time. The survival uses for mushrooms are many. Just as you should know your trees and your plants, get to know your mushrooms.