Plagiomnium is a genus of mosses in the family Mniaceae. These mosses are distributed in temperate and subarctic regions worldwide and are commonly known as rock mosses or pincushion mosses.
Plagiomnium mosses are found in a variety of habitats, including rocky outcrops, forest floors, and damp soil. They have a dense, cushion-like growth habit, with many stems growing from a central point and forming a rounded or domed shape. The leaves of Plagiomnium mosses are long and slender, with a pointed tip, and they grow in a spiral pattern around the stem.
In the terrarium hobby, Plagiomnium mosses are highly valued for their unique appearance and their ability to thrive in a variety of growing conditions. They are often used to create a natural, forest-like environment for reptiles, amphibians, and invertebrates. Plagiomnium mosses prefer moist, well-draining soil and moderate to high humidity levels. They can be propagated by dividing the clumps or by placing stem cuttings in a moist substrate.