View the spoiler for my guess at what I think it might be, but please first come to your own conclusion before looking at mine — I don't want to bias your guess.

They were found in mid-november in the Salish Coast region of Cascadia. They were growing out of woodchips composed of a mixture of western hemlock (majority), and western red cedar.

Side view of one full mature specimen:

A group with a sample of the substrate (the cap appears to be umbonate):

A closeup side view, and internal view of the stem (it appears to be hollow):

Cross section of the gills — they appear to be adnate, or sub-decurrent:

Underside of view of the gills:

Spore print (first on white background (the split is due to two halves), second on a black background):

Examples specimens once dried:

Examples of the colony, and the location/substrate in which it was growing:

Cross-posts:

• https://sh.itjust.works/post/28348066
• https://sh.itjust.works/post/28348063
• https://sh.itjust.works/post/28491127

I love seeing these groups pop up everywhere! They are such a fantastic resource to help prevent deadly mistakes, but also great for learning more about the incredible variety of mushrooms all around us, many of which are too tiny to casually notice but contain such beauty. As a kid I would hunt morels with my grandpa and that probably inspired me to keep my eyes open. Several years ago I had some huge mushrooms pop up in my yard, and after getting a positive ID I fried them up and ate them. Sometimes you just get lucky with what the squirrels drag into your yard.

Now I've finally taken the next step to growing my own, and yesterday transferred my first starts of oyster mushrooms to grain jars. I also managed to start some cremini spawn on boiled cardboard, and just giving it a little more time before transferring that to grain jars as well. Can't wait to taste all the results!