fronds linked like a beaded chain

Size
Length: 10–30 cm
Lifespan
10–30 years
Diet
Grows in damp, shaded corners of forests on stream banks, rock faces, and tree fern trunks. Requires constant high humidity, deep shade, and protection from drying winds. Prefers vertical surfaces where water trickles constantly. Tiny, bead-like leaflets are arranged along a slender stem.
Habitat
The necklace fern grows in the damp, shaded corners of New Zealand's forests. From Northland to Stewart Island. On stream banks, rock faces, and the trunks of tree ferns. It is a small fern, a modest fern, a fern that does not demand attention. But if you look closely, you will see the beads.
Range
Found throughout the North and South Islands, Stewart Island, and the Chatham Islands in damp, shaded forests. Most common on stream banks, rock faces, and tree fern trunks from sea level to 1,000 metres, from Northland to Southland. Also found in Australia, so it is not endemic.
Endemism
Native
Main Threats
None significant as this species is abundant and secure throughout its range. It is common in damp, shaded habitats from sea level to 1,000 metres, particularly in wetter western forests. Forest clearance and drying of stream banks can reduce local populations occasionally.
Population
Abundant and secure throughout New Zealand, though often overlooked due to its small size. The necklace fern is common in damp, shaded habitats from sea level to 1,000 metres. It is also found in Australia, so it is not endemic to New Zealand. No conservation concerns. It is not rare.
Conservation Status
Not Threatened
You have to get low to appreciate the necklace fern. It does not tower over you like the mamaku. It does not spread massive fronds like the king fern. It grows close to the ground. Or on damp rock faces. Or on the trunks of tree ferns. Its fronds are delicate and finely divided. They are arranged in a creeping, sprawling mat. The perspective is key. You must look down. The leaflets make it special. Each frond is divided into dozens of tiny, bead-like segments. Flabellifolium means fan-leaved. But they look more like beads. They are small and rounded. They are arranged alternately along the stem. Like pearls on a string. The whole frond has a soft, lacy, almost feathery appearance. The fronds are not upright. They arch and sprawl. They creep over the surface of the rock or the tree trunk. This forms a green mat. It looks like someone spilled a box of tiny ferns. The visual effect is distinct. It covers damp places. The necklace fern is a pioneer of wet, shaded surfaces. These include the vertical faces of stream banks. The mossy trunks of tree ferns. The damp crevices of limestone outcrops. It holds moisture. It traps sediment. It creates a micro-habitat for insects and other small creatures. The ecological function is subtle but vital. It supports the smaller life forms. Reproduction occurs by spores, like all ferns. The sporangia are clustered on the undersides of the leaflets. They are protected by a thin membrane. When the spores are ripe, they are released into the damp air. It is a fern of patience. It does not grow fast. It does not compete aggressively. It finds a damp spot. It puts down roots. It spreads slowly across the surface. In a year, it might cover a handspan. In a decade, a square metre. In a century, it will still be there. Doing the same thing. The pace is glacial. In a world of dramatic tree ferns and giant king ferns, the necklace fern is the quiet one. It is the fern you step over without noticing. The fern that lives in the shadows of the giants. But if you stop, if you kneel down and look, you will see the beads. The tiny, perfect, bead-like leaflets strung along the stem like a necklace. It is not flashy. It is not famous. It is just a small fern doing small fern things. And that is enough. No one told it otherwise.