up to 1 cm in diameter, on an extremely well-rotted log
Pinckney Rec
within 25 feet perimeter fence to new housing development on bare ground under beech tree unturned rim on smooth inner cup of lighter shade than external markings, scurfy exterior, resembles split acorns, no stems, macroscopic examination only
221011_21
Spores eliptical, finely warty with one or more rarely without glutule, without polar apiculae, 1.5-16.5 x 7.5-8.8 um. Ascii amyloid on the tips in Melzers.
This means Peziza or closely related genera.
By the keys could be: P. natrophila, P. merdae, or P. arvensis though not sure.