Riccia fluitans does not develop a root structure, but it is capable of anchoring itself over time to a surface. When a clump is small and thin, it will float just below the surface of the water, barring any current which would push it around, but as the mass thickens and grows, it will tend to sink. When it comes into contact with a surface for an extended time period, (days or weeks), new growth may anchor it there. This particular trait can be used to good advantage by placing a mass of Riccia fluitans against the chosen surface such as driftwood, or rock and then fastening the Riccia to the surface by wrapping repeatedly with thin thread. After a surprisingly short time,(as little as two weeks), the thread will no longer be visible, having been grown over with new growth from the plant. The resulting effect is much like a beautifully cultured lawn or a rich bed of luxuriant moss on a rock. If desired, the thread can then be cut away, leaving the Riccia firmly anchored to the item.