these mushrooms are growing in my garden out of nowhere. I have been keeping it pretty moist just because I wanted the flowers and vegetables to take root. No odors I did use steer manure when it first planting everything in the garden. one picture is right after I picked it about 5 minutes. The other one is one still alive in the garden. All look the same. that picked one looked exactly the same but it turned darker after I picked it. the stem and everything else look pure White beforehand even the girls underneath look pure white. Do I need to let them grow for a bit longer so they develop more characteristics? Any help is appreciated. the darker color goes from lighter brown to darker brown, only after picked I noticed the color.