That is literally moss out of my backyard. I have a nice corner of the land that is completely covered in wild moss. It is actually not growing in these pictures. I harvest it during dry times of the year and keep it stored dry in the dark. Once I add it too an enclosure I mist it every few days and it grows! Moss needs to be wet to grow best. High humidity and dampness is it's friend. It grows very very slowly. To get it to grow on wood you need to have the wood waterlogged and just tie the moss on. Keep the wood and moss wet and in a few months it will start to creep out. After a year or two it looks completely natural.