On thin soil of a rocky ledge under oak and hemlock. I looked up in my new moss book Atrichum angustatum, the first suggestion from CV. Habitat is good, stalk length is good, curved capsules compatible. This must be a very dry specimen.
Petrel Point Nature Reserve, Bruce County, Ontario, Canada
massive quartz tech happening here - monumental feature
Second and third images are 40x, all thereafter are 100x magnification. Last five images are from a recollection from the same individual on 17 June 2020.