Game imagery is so pernicious that it is starting to invade science fiction novel cover art.  Here, from Jeff Vandermeer’s forthcoming FINCH, which almost certainly contains mushrooms galore, is some architecture that appears to have come straight out of Mario’s Mushroom Kingdom.  My kids saw only this much and thought these were Mario mushrooms:

Yes, that cover really is beautiful.

Meanwhile, from Ed Lerner’s forthcoming SMALL MIRACLES, a novel of nanotechnology gone awry, a bookjacket covered with a bunch of iconic Metroids:

Here is a real Metroid for comparison purposes.

And here is a mushroom.

Please do not rely on this guide in the field.  Speak to an expert before consuming any wild-caught mushrooms or Metroids.