Riccardia chamedryfolia

Riccardia chamedryfolia is a small thalloid liverwort — meaning it grows as a flattened, branching ribbon rather than from a stem with leaves — found on wet rocks, rotting wood, and stream banks across temperate Europe and parts of the Americas. In the aquascaping world it is known as Coral Moss or Mini Pellia for the dense, finely branched fronds that pack together in a way that resembles a colony of small stony corals. It lives equally well submerged in an aquarium or emersed in a high-humidity terrarium, where it anchors poorly on its own and benefits from being tied to driftwood or porous stone with thread or aquarium-safe glue until it establishes. Growth is slow — expect weeks to months for a noticeable spread — and it is easily overrun by faster-growing mosses or algae if conditions tip in their favour.