While there is moss in that image, the thing in the middle looks like a fruticose lichen, possibly a Cladonia sp.

Don't know how it would do in a terrarium. The members of this genus that grow around here tend to like lots of light and many prefer rather dry conditions.

The moss looks like Leucobryon
See this link for image
{{gwi:179569}}

It should do well in a closed container if it is kept cool.
I am growing a plant of it in one of those supermarket cake/pie containers that has a plastic base with a plastic dome top. It is outside in mostly a shaded spot with only less than an half hour of sunlight.