Armillaria Mellea is the scientific name of this mushroom as well known as “Honey mushroom” due to their sweet taste. They are edible but some people may be intolerant to them.
However sweet and edible, they are a desease and a plague, and they act as tree parasites. In any tree that they are born, they feed of it and very easily and quickly multiply themselves. The final result is the death of the tree.