Thanks, glad that you like the photo. But, in fact, this was growing high up and I wasn’t seeing well what I was doing.

I want to echo Dan’s comments. The top photo really catches the eye. Maybe it is old, but maybe the reflected light from the water filled the image with uniform illumination letting the camera do what it is supposed to do: capture crisp detail. The oyster really seems to float on a silver screen. Nice job!

of the enormous Pleurotus colony we found on fallen cottonwood a year ago in the same place. seems like a safe bet.

I didn’t see the second picture when I suggested Hypsizygus. Now I see that you were right from the beginning. With that gill attachment, it’s a Pleurotus, no doubt. On cottonwood and strongly yellowing, I’d guess Pleurotus populinus.
Now I see that MycoBank says that the name populinus is invalid – but there’s no other name for it..

Thanks! The colors are what the camera produced and from what I remember are not far from what it really looked like. (I set the camera to take the measurements on the spot it focuses on.) It’s probably just that the mushrooms were old.

Thanks for the ID. I didn’t pay enough attention. The mushrooms were growing on cottonwood and were very maggoty.

Hi Sava,

Great detail in this photo!

I can’t help but think the mushroom looked whiter, but that dialing in a whitish mushroom would have washed out the sky. Was there something like that going on with the photo, or did the mushroom really appear that dark to your eye? It seems not quite white enough for Hypsizygus ulmarius, but otherwise seems to be a match.