Colletti says growing moss in a terrarium can be a challenge, because there's a lot of moisture and little air circulation. She prefers open-topped containers. Climacium americanum (commonly called lobe-leaved tree moss) and Hedwigia ciliata (fringed hoar-moss) work well in any kind of container, she says. Leucobryum glaucum (pincushion moss) and Cladonia rangiferina (reindeer moss, actually a lichen) are best used in open containers. In this image, sheet moss surrounds other small plants.