Glad I checked the forum before I posted my pics. I think my mystery moss might be the same type but smaller/younger. I thought it might be Running Cedar (lycopodium digitatum) but perhaps still young or undeveloped. These appeared in the soil of another plant during the last month. Doesn't make sense because it's been very dry here and I've barely kept up with watering. However, I have a ton of Running Cedar at my summer house and the spores could have easily hopped a ride to this location, though I've never seen it up here. Could be a less common lycopodium as well. I've never seen it look like this. These are about 3 inches tall.

Psilotum nudum.