Black Crystalwort (Riccia Nigrella) is a perennial moss (liverwort) in the Ricciaceae family with moderate care difficulty. It requires high watering and partial shade or dappled_shade light in USDA hardiness zones 5-9. This plant is safe for cats and dogs. It can be grown indoors.

Riccia nigrella is a small liverwort characterized by its dark green, bluish-sheened thallus with a distinct median groove, forming persistent rosettes or patches.