It is not possible to determinate the species without more detailed images and description of some characters such as consistency of the flesh, any particular smell, measures of caps and stipe, color of sporeprint etc...
It should be sayd that it belongs to Basidiomycetes, as already indicated.
I agree with the former reaction: you cannot ask this without more information, we even do not know which part of the world you photographed the mushroom. It might be a Gymnopus species, but that is just a wild guess