Substrate: old Populus trichocarpa log.
Reference: Koukol, Ondřej. (2016). Myriococcum revisited: a revision of an overlooked fungal genus. Plant Systematics and Evolution. 302. 10.1007/s00606-016-1310-x.
On birch (Betula sp.).
Southwestern Ontario, Canada.
On a fallen bigtooth aspen (Populus grandidentata) in dry, rocky oak forest.
Parasitized by Syzygospora mycetophila (https://www.inaturalist.org/observations/53603527).
On soil under northern red oak and northern white cedar.
I believe it is a fungus and slime mold on top of the brown mass, which could also be fungal.
3.7 cm wide on well-rotted conifer log.