"The Hypsizygus tessellatus or shimeji is an edible mushroom native to East Asia. Buna shimeji is cultivated locally in Europe, North America and Australia and sold fresh in markets." Taken from Wikipedia.

I think I'm right in saying that these are Bunapi shimeji. At least two years ago, I noticed a small container of these at Safeway, my grocery store, but felt they were too expensive to buy, just to photograph. Then four days ago, I noticed that Safeway had finally got another package of them lying on the shelf amongst all the more usual mushrooms. Not expensive at all, so here they are, lol! Apologies to the first three people who commented on this image - they may have thought I'd walked for hours in some dark forest to find these! Needless to say, this is a macro photo. And, no, I won't be eating them : )

en.wikipedia.org/wiki/Hypsizygus_tessellatus

en.wikipedia.org/wiki/Shimeji