If you are looking for a Begonia species that has it all for terrarium culture, this is an excellent choice.  It is a small growing, compact species that is easy to keep and propagate, and has beautiful foliage (even the backsides of the leaves are something to marval at).  It is a Rhizomatous species native to Central China.  “Leslie Woodriff called it the “Fairy Carpet” begonia because of the velvety appearance of its dark green leaves, frosted with silver and covered with thick red hairs, especially down the veins.” (from Begonias.org). Caution is advised during summer months, as this species does not like heat.  The flowers range in color from whiteish-pink, to more yellow like the ones below.  Tepals are covered in pinkish red hairs.  More information and photos can be found here. 

Available plants are well rooted in 2″ pots.  They will be shipped potted.  The last photo is representative of the size plant you will receive.