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.
My guess
Psilocybe cyanescens
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:
@dandelion @Romkslrqusz I concur. Definitely not Psilocybe cyanescens based on various features of the cap and stipe. Generally, in P. cyanescens, there would be a striking contrast between the white stipe and the caramel-colored cap on young specimens with a rubbery cap surface. (I have difficulties with distinguishing spore color on spore prints but kudos on the photos)
@dandelion @Romkslrqusz Psilocybe cyanescens tend to look somewhat even in size, see picture.