That looks like a pretty young mushy. Any more info? Pics of more mature specimens? Type of soil (lots of wood in it or mulch in it or gravely) weather conditions, near any type of tree, etc. Something to compare size to?

And is the cap moist or shiny naturally, or did you rinse it?

Here are a couple more pics. These are growing in an area I mulched last fall. They are near my water faucet, which always leaks a little bit, and keeps the soil moist. The caps are not shiny when they are dry, but any water turns them shiny and slimy. The piece of wood this one is on is about 3 inches wide. They are growing near a mature pink mimosa tree, but this is the first year I have seen these. I think they are probably coming from the mulch. The large one in the first photo is about as big as they get.

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I'll take a wild stab at it. Check out the attached link for images.

Here is a link that might be useful: Russula atropurpurea

That sure looks like them.

Did you look at the image of the gills, too? Whatcha think, bobcat?

Here is a link that might be useful: check it out...