Most people are concerned with whether a mushroom is edible or not. There are many poisonous mushrooms, and there are edible mushrooms. If you don't know the exact difference, you are really sick, or dead. But none of this should matter to a person trying to survive. Don't eat mushrooms. What most books don't explain is that mushrooms are thermogenic. In other words, they take more energy from the body to process, than you obtain from them. Therefore, you can literally starve yourself to death eating mushrooms (that is also why they are considered a diet food... you feel full but you gain nothing). IMHO, Do yourself a favor, find something else to eat.

my grandma used to teach me how to know the edible mushrooms from the poisonous ones..she told me to put salt on it..if it comes black then it is an edible one and if it comes yellow it is poisonous..i tried it and it always comes black i never met the yellow color before.