wanted to say im pretty sure this was a hitch hiker on the grass. it seams to be growing at spots now away from the grass with out runners that i can see. i also dont see roots. this stuff is super tiny! i think its a moss but way nano size. i cant stress how small it is.
About the only thing I can tell is that it's a moss. Highly detailed, really sharp photos might help, but consulting a bryologist is probably the best option. It's one thing to know what native stems and so on are, but with moss it's a whole new ball game.