Identification
Commonly known as the Cypress-leaved Plait-moss, this species is a master of disguise. Look for its signature "plaited" appearance: the tiny, overlapping leaves are strongly curved (falcate) and point in one direction, resembling the scaly foliage of a cypress tree or a neatly braided cord. While typically a rich forest green, specimens in sunnier spots often turn a burnished gold or pale lime. To distinguish it from the similar *Hypnum jutlandicum*, look at the growth habit; *cupressiforme* forms dense, flattened mats that hug the substrate tightly, whereas its relatives often look "plump" or more erect.
Habitat & Range
This is arguably the most widespread moss in the world, found on every continent except Antarctica. It is a generalist extraordinaire, carpeting everything from acidic tree bark and decaying logs to limestone boulders and urban stone walls. You will find it in lowland deciduous forests, subalpine woodlands, and even city parks, as it is remarkably tolerant of air pollution.
Behaviour
As a pleurocarpous (creeping) moss, it spreads horizontally, weaving velvet-like carpets that can eventually smother a fallen branch. It is poikilohydric; during dry spells, it enters a dormant, shriveled state to conserve moisture, only to "reanimate" and expand into a lush green cushion within seconds of a rain shower. In late autumn, it produces elegant, reddish-brown capsules—slender, curved urns on long stalks that tilt as if nodding in the breeze.
Diet
Lacking true roots, this moss "eats" the atmosphere. It performs photosynthesis to create energy from sunlight and absorbs water and dissolved minerals directly through its delicate, one-cell-thick leaves.
Fascinating Fact
Its genus name, *Hypnum*, is derived from the Greek word *hypnos* (sleep). Historically, this moss was harvested in bulk to stuff pillows and mattresses, as its soft, springy texture and earthy scent were believed to induce deep, restful slumber.