Wildlife Spotting

It's always worth giving Agaricus species a sniff - their different odours can be important identifying features, particularly in determining edibility. Anise, phenol, brine and almond are common smells you may come across in this genus and they are often strongest nearest the base of the stem. All known Agaricus mushrooms with an appetising aroma are believed to be safe, but you have to be confident in your nose if you're going to eat them! Colour changes to cut flesh are also useful, typically yellow or red and how quickly and intensely the stain occurs.

Yup, so it's an Agaricus with brown gills like that. Something like Agaricus augustus. Unfortunately Agaricus is a genus in which it is hard to get a solid species level identification without microscopy. I think the season is a bit early for augustus so not sure exactly what it is.

Really needs a gill shot to identify this one. Don't worry about picking mature mushrooms, compare it to picking an apple from a tree, it doesn't much bother the fungus beneath. And no mushrooms are transdermally toxic by the way.

Sorry... not a puffball. Didn't see the stem.

I'm not sure this is a puffball, I think the photos just don't show the stem/gills. Did it have either? Looks like an Agaricus species to me.