It looks like a Sphagnum to me. I don't know which species it might be but I linked to S. centrale because it looks quite similar. Here is a link that might be useful:

Image 1: Dicranum Image 2: Thuidium Image 3: Polystichum (commune) the tall pine like one Reason you could not get the image up was because you did not have the entire address of the image. Note the address will end with .jpg for your image. To find your image complete code right click on your image and then click on Properties, then click on the address and use right arrow button to scan to end of address. Here is the coding that you use See example click here

Since the image has been removed I cannot say that the image was this Cladonia since this is an Artic species. But speaking of lichens in gerneral. To grow them you need a very cold spot to set them in. Inside a terrarium is ok if you can ventilate it. My experience with lichens is that they need it cold and tend to do well with dry feet but appreciate being watered or sprayed regularly during the day every day. Their greatest enemy are snails and slugs which can eat out a whole colony. Moist humid shade with cold air and good air movement seem important.

Could be an algae. Open up your terrarium and let it stand exposed to air for a day and see what happens.