What was it?

Because my weeds were caught up in them and um, I destroyed them while pulling the weeds. Ooopps. Maybe two varieties? One had spots around the edge of the top.

They were growing under the shade of cut leaf geranium, going to seed chickweed, dock, and others. They appear to be growing on the soil, though a sumac tree was taken down last year. It's roots could easily have reached this far.

It's usually difficult to identify most wild mushrooms from photos posted online, but your mushrooms might be members of the Psathyrella candolleana group, a species commonly found growing near the roots of hardwoods (like sumac) that have recently died or been cut down:

https://www.mushroomexpert.com/psathyrella_candolleana.html

The spore print is dark brown. I see this one (or something related to it) all the time in the spring, usually in the root zone of decaying hardwoods.
However, to be absolutely certain of your mushroom's ID, you would probably need to have the DNA analyzed!