Identificaciones de ethancrenson

The first ID suggestion posted to facebook Ascomycetes of NA was Sowerbyella rhenana, a good starting point, but likely not the correct ID, as the mature spores dropped by my fruit bodies have dimensions 9-13 x 4-5.5(6.5) that era significantly different from what is reported for S. rhenana, 18-23(26.3) x 9-13.

I posted this to Asco France and got soem good help from those folks. A key provided led me to three names of species that are similar: S. radiculata var. kewensis, S. polarpustulata, S. brevispora. The latter seems like the best match, although the color of the hymenium is described as darker than for my observation. I used the following chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.funga.fi/Karstenia/Karstenia%2024-1%201984-4.pdf .
Material has been dehydrated and is available for study.
Mirrored at https://mushroomobserver.org/550082?q=1oaSB. Also, see discussions at Facebook Ascomycetes of NA and Asco France.

Habitat Description: mulchy trail, Hardwoods, maple, oak and I think Prunus nearby (last photo)
Fruit Body Abundance: Solitary

Odor: no specific smell
Taste:

Chemical Tests:
UV Reaction: No reaction, maybe yellowish on gills

Other Distinctive Features:

Microscopy: