This is my fascinating, completely by accident, very cool moss I have growing in the greenhouse.  My mesquite trees prefer less than ideal soil to grow in, so I use the sandy clay from the yard to start the trees.  A couple months ago, moss started to grow in a couple of the shaded pots!  I thought to myself, "Since when did moss grow in the desert?"  Turns out it is quite common!

I believe this to be some kind of Tortula Moss.  The really crazy thing is that I found out while looking it up online is that it can complete dehydrate and after being rehydrated, can repair itself in minutes.

Provided it is not invasive, I plan to try to move the moss in another container and once I get a few gardens in outside, try to transplant it into a moist, shady area.  I am contacting the Master Gardeners at Cooperative Extension here to see if I can find out more information.

I had no idea that this kind of thing grew in the desert.  Learn something new every day!