Boletes don’t have gills, just pores. But in an interesting evolutionary twist some boletes developed to have pore tissue shaped like gills. Anyway I have no idea what you found.

It looked more like when you have a blue memory foam mattress pad but then it starts to yellow and turn "too much b vitamin" piss colored

Even if it wasn't lookin like that though im not eating a wild mushroom, you might have heard me say this before but i don't want to poop out my kidneys and liver

Bolete of some kind. Most likely non-poisonous, but even if it was an edible mushroom it looks a little past its prime.

I am bad with Boletes, but the cap looks too dark for boleteus cyanescens imo, but again, i suck ass at identifying boletes try r/mycology or r/mushroomid for more.

Also, country of origin may help. Sorry I couldn't be more helpful :(