Why mushrooms are green in colour?

Answer 1

The only green mushroom I've heard of is the Parrot Wax Cap, which I believe is native to Great Britain. Perhaps they are common there? Most mushrooms are whitish to brown, although there are some colorful ones which are red or orange.

Why green, is a little harder to answer. Fungus, of course, doesn't produce chlorophyll, nor does fungus need to blend in with its surroundings since the mushroom is not vital to the life of the fungus. The mushroom is merely used to spread its spores, and typically only survives a couple of days, while the main body of the fungus - the mycelia - lives underground. Bright colors can attract birds and insects, helping to spread the spores.

Perhaps you are thinking of green mold? Molds get their color from their spores, and the spores get their color from quinones. Again, bright colors can attract insects and birds, helping to spread spores.