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About the size of a dinner plate with a dark cap with concentric lines and a white underside with pores. It is a ubiquitous fungus in the forests here, and a fungus with one of the largest fruiting bodies that I have seen on the island. I was told the dark, dull cap and the range help distinguish this species.
On Sitka Spruce in a mossy, shady spruce forest outside of town.
I have only ever observed them on the Sitka Spruce, and not on any Black Cottonwood or alders. I have read that this species has been observed on both hardwoods and conifers, which is unusual for members of this genus. This species was only discovered in 2008, often being mistook for other similar species.. More info on that in the reference link. I have some better photos of a younger specimen with closeups showing the underside and guttation here: https://www.projectnoah.org/spottings/45...