There are some others about that a search with keywords (Description / Tags) such as cryptobiotic, cryptogamic, and soil crust bring up a few observations that would need further filtering for such a project.
https://www.inaturalist.org/observations?place_id=any&q=cryptogamic&subview=grid
https://www.inaturalist.org/observations?place_id=any&q=cryptobiotic&subview=grid
https://www.inaturalist.org/observations?place_id=any&q="soil%20crust"&subview=grid
Interesting that there are these complex communities of organisms that exist yet are easy to overlook by some of us (me) because we ( I) don’t know what to look for. This topic brought me back to looking at Lichen as a pioneer species and how certain complexes need to be in place in order for other organisms to exist. It also made me think about biofilms and how they exist to form syntrophic consortiums of microorganisms. All very important stuff to consider when trying to understand an environment.
This does not answer your question @beetle_mch but I think @mreith suggestion of a project would be best for purposes of keeping track. And, I think that @pfau_tarleton is correct in saying it is “Life” or pick a fitting sub-kingdom or phylum know that it will never reach species. It would be nice if there was an easy way to populate such a project that was not manual (like this (shameless plug)).