waves on the damp stream bank soil

Size
Height: 2–5 cm
Lifespan
2–5 years
Diet
Grows on damp soil, stream banks, and disturbed ground. Requires consistent moisture, partial shade, and acidic to neutral soil. Tolerates moderate disturbance but cannot survive prolonged drought.
Habitat
Grows on damp soil, stream banks, and disturbed ground throughout New Zealand. A creature of the wet ground, the soft earth, the places where the soil is damp and the light can reach. Forms loose, leafy tufts of pale green to yellowish-green leaves that have a distinctive wavy, undulating surface.
Range
Found throughout the North and South Islands on damp soil, stream banks, and disturbed ground. Most common in lowland and montane forests with consistent moisture. Also found in temperate regions worldwide.
Endemism
Native
Main Threats
None significant. This species is common and widespread in damp habitats. Localised threats include drainage of wetlands, stream modification, and climate change reducing soil moisture. Classified as Not Threatened.
Population
Not Threatened. Atrichum moss is common on damp soil, stream banks, and disturbed ground throughout New Zealand. It is a widespread species found in temperate regions around the world.
Conservation Status
Not Threatened
Human Risk
harmless
Handling Note
common moss, safe to handle
Conservation Note
Native moss; not assessed by NZTCS as bryophytes are generally outside the scope of current threat classifications.
Te Ao Māori
No recorded Māori name distinguishes the atrichum moss from other mosses. Mosses were generally called pūkohu (mosses and lichens) or rimu (a general term for small, low-growing plants). The wavy, rippling leaves on the damp soil would have been noticed. They looked like the surface of the water. Like the waves of the sea. But no distinct name survives. The atrichum moss was sometimes used as a bedding material. The soft, leafy tufts were gathered and dried. Then used to line sleeping places.
It waves at you. The atrichum moss has upright stems. Reaching 2 to 5 centimetres in height. With leaves arranged in a loose spiral around the stem. The leaves are long and narrow. With a distinctive, undulating (wavy) surface. This catches the light and creates a rippling effect. The leaf margins are toothed. The leaf tip is sharp and pointed. The colour is a pale, yellowish-green to bright green. Often with a translucent quality. It is the moss of the wavy blade. The one that looks like it is in constant motion even when the air is still. What makes it special are the waves. Atrichum moss is one of the few mosses with distinctly undulating leaves. The wavy surface is caused by the leaf cells being arranged in a pattern. This creates ripples across the leaf blade. These waves catch the light. Making the moss shimmer and glow in the sun. They also increase the surface area for photosynthesis. Allowing the moss to capture more light. It is the moss of the rippling light. The one that dances in the sun. The one that makes the damp soil look like it is covered in tiny green waves. The leaves have another feature. They are long and narrow. With a distinct midrib that runs the length of the leaf. The leaf margins are toothed. The leaf tip is sharp and pointed. The leaves are arranged in a loose spiral. Giving the plant an open, airy appearance. Under a hand lens, the teeth on the leaf margins are visible. Tiny sawtooth edges that catch the light. Biologically, the atrichum moss reproduces by spores. Released from capsules on tall stalks. The capsules are curved and asymmetrical. Like little urns perched on slender stems. When the capsules mature, they split open. Releasing thousands of tiny spores into the air. To find atrichum moss is to find the loose, leafy tufts of pale green on the damp soil. The leaves ripple and wave. Catching the light like small green blades. It is the moss of the wavy leaf. The one that looks like it is in constant motion. The one that proves that even the smallest plants can dance. It does not stop moving. Even when the wind is gone.