It's not a moss... and it's not a fern. By trade, most people call this 'Club Moss' or 'Tassle Rock Fern'. A beautiful species with dark-green, shiny, flat and round leaves native to the peninsula of Malaysia ( Kedah, Peneng Island, Kelantan, Pahn, Johor), Java, Sumatra, and Thailand. It is an intermediate to hot growing plant. Growing in pots placed in 6" baskets to allow the foliage to hang over the edge of the pot. Note there are a few dry leaves in the pictures. These are sparse and result from importing stress. They are now established and growing new roots/leaves. As time goes by, eventually you will have nothing but solid green leaves on the entire plant. Truly a beautiful species!

Here is a website link that has very intimate details on this species:

https://www.exoticrainforest.com/Huperzia%20nummulariifolia%20pc.html