glossy, thick, built for coastal wind
- Size
- Length: 10–30 cm
- Lifespan
- 20–50 years
- Diet
- Epiphytic, growing on tree trunks, rock faces, and even buildings. Requires bright, indirect light and tolerates a wide range of moisture conditions. Can survive in sun or shade, wet or dry, making it one of the most adaptable ferns in New Zealand. Prefers vertical surfaces.
- Habitat
- The leatherleaf fern clings to the trunks of trees, the faces of rocks, and the walls of damp buildings throughout New Zealand. From Northland to Stewart Island, sea level to subalpine zone. It is a fern of vertical surfaces, a fern that does not need soil. It is tough.
- Range
- Found throughout the North and South Islands, Stewart Island, and the Chatham Islands on trees, rocks, and buildings. Most common in lowland and montane areas from sea level to 1,200 metres, from Northland to Southland. One of the most widespread ferns.
- Endemism
- Endemic
- Main Threats
- None significant as this species is abundant and secure throughout New Zealand. It is one of the most common and adaptable ferns in the country, found on trees, rocks, and even buildings. Removal of host trees in urban areas can reduce local populations.
- Population
- Abundant and secure throughout New Zealand. The leatherleaf fern is one of the most common and widespread ferns in the country, found on trees, rocks, and even buildings from sea level to 1,200 metres. It is not threatened. It is not rare. It is everywhere.
- Conservation Status
- Not Threatened
This fern has a superpower. It does not need soil. Most plants, even most ferns, demand a certain amount of dirt. They want organic matter, nutrients, and a place to sink their roots. The leatherleaf fern does not care. It will grow on bare rock. It will grow on the bark of a tree. It will grow on a concrete wall in the middle of the city. It sends out creeping rhizomes, which are thin and wiry stems. These crawl across the surface, anchoring themselves at intervals. The rhizomes are covered in small, round, star-shaped hairs. This gives them a felted appearance.
The leaves are the star. They are thick, leathery, and oval-shaped. They are not divided into leaflets like a typical fern. They look almost like a flowering plant. The upper surface is dark green and glossy. The lower surface is pale. It is covered in dense, stellate hairs. These are the same star-shaped hairs that give the fern its species name eleagnifolia, meaning olive-leaved. The texture is distinct. It feels substantial to the touch.
Toughness makes it special. The leatherleaf fern is a resurrection plant. It can survive extreme drought. It curls its leaves to reduce water loss. Then it unfurls them again when the rain returns. It can tolerate salt spray, wind, and poor air quality. It grows in full sun or deep shade. For a fern, it is almost indestructible. It endures conditions that would kill more delicate species.
It covers bare surfaces. In a forest, it grows on the trunks of tree ferns and broadleaf trees. This creates a living skin of green. On rocky outcrops, it forms mats that trap moisture and sediment. This creates soil where other plants can eventually grow. It is a pioneer. It is a coloniser. It is the first green thing on a bare surface. It prepares the ground for others.
Reproduction occurs by spores, like all ferns. The sporangia are clustered on the undersides of the leaves. They often cover the entire lower surface. When the spores are ripe, they are released in clouds. It also reproduces by fragmentation. Pieces of the creeping rhizome can break off and grow into new plants. A single plant can spread across a rock face over time. This creates a colony of genetically identical individuals. The spread is slow but persistent.
In a world of demanding plants, those that need rich soil, perfect moisture, and dappled light, the leatherleaf fern is different. It says it will grow where it wants. It does not need approval. It does not need help. It just needs a surface, a bit of moisture, and the patience to outlast everything else. And it will. The leatherleaf fern will be here long after we are gone. It will grow on the ruins of our buildings. It will cover the stones we leave behind. It remains green, tough, and completely indifferent. No one told it otherwise.