Are these coming up out of tree roots? They look somewhat like oysters, and i have seen oyters grow up from roots before, If you could pick the mushroom, flip it over and take some pics It would be easier to id.
Hh, in this location, there was a stump that I used a stump grinder to remove below ground level. So, yes, there is a stump, but under ground.
It was white in color for first several days/week.
I posted same pics on another site and posters feel it is an oyster.