Vesicularia montagnei

Christmas Moss grows in tiered, drooping fronds — each lateral branch resembling a tiny fir tree — which is how it earned its common name. Native to shaded stream banks and rocky splash zones across tropical Asia, from Japan south to northern Australia, it naturally spends time both submerged and exposed to air, making it equally at home in an aquarium or at the waterline in a paludarium. It attaches to rock and driftwood via fine hair-like rhizoids rather than true roots, and does best in 20–28 °C with consistent moisture and indirect light. In terrariums it can be challenging: it needs very high humidity without stagnant air, and fungal rot is the most common failure mode.