Shining Spleenwort – clings to the coastal streamside banks

clings to the coastal streamside banks

Size: Length: 30–90 cm
Lifespan: 20–50 years
Diet: Photosynthetic. Draws energy from sunlight and nutrients from surrounding water and soil.
Habitat: The shining spleenwort clings to coastal cliffs, rocky outcrops, and the damp faces of streamside banks from Northland to the Otago coast. It is a fern of the edges. Where the forest meets the rock, where the spray from the sea reaches the leaves, where other ferns hesitate to grow. It asks for moisture.
Range: Found throughout the North and South Islands, Stewart Island, and the Chatham Islands on coastal cliffs, rocky outcrops, and streamside banks. Most common in coastal areas from sea level to 600 metres, from Northland to Southland, particularly abundant on the west coast of both islands.
Endemism: Native
Main Threats: None significant as this species is abundant and secure throughout its range. It is one of New Zealand's most distinctive coastal ferns, common on cliffs and rocky outcrops. Coastal development has reduced some local populations. Climate change and sea level rise could affect coastal habitats.
Population: Abundant and secure throughout its range. The shining spleenwort is one of New Zealand's most distinctive coastal ferns, easily recognised by its broad, glossy, leathery fronds that seem to reflect light. It grows from sea level to about 600 metres, often in exposed situations. No conservation concerns.
Conservation Status: Not Threatened
Human Risk: harmless
Handling Note: native spleenwort, harmless to humans, leave undisturbed
Conservation Note: Native fern; widespread in lowland and montane forests throughout New Zealand.
Assessment: NZTCS Vascular Plants (2023)
Te Ao Māori: The shining spleenwort was likely grouped with other coastal ferns called pikopiko or mauku. The young shoots of many Asplenium species were eaten as a vegetable. A rock face covered in shining spleenwort was a rock face that was stable, damp, and safe. It meant that the land was holding together. The glossy fronds that catch the light are a reminder. Even on the exposed coast, where the salt spray never stops, the forest still finds a way to shine. It persists.

A coastal track. The wind in your face. The sea crashing below. You look up at a rock face. It is damp and dark, covered in moss. There it is. A cluster of fronds, broad and green. They are so glossy they look like they have been varnished. The shining spleenwort. The fern that shows up to the party in a clean shirt while everyone else is wearing moss. It stands out. It demands attention. The shine makes it special. Other ferns are matte. They absorb light. They drink it in. They disappear into the shadows. The shining spleenwort reflects light. Its fronds are broad and leathery. They are so glossy that they catch the sun even in the gloom of a coastal cliff. They look like they have been polished. They look like they care about their appearance. This is not an accident. It is a feature. The fronds are not divided into dozens of tiny leaflets like the hen and chicken fern. They are simple. Or rather, they are once-divided. They have broad, oblong segments that look like individual leaves. The whole frond can reach sixty centimetres in length. The colour is a deep, rich green. It is the kind of green that makes you think jungle. This persists even when you are standing on a windswept cliff. The contrast is striking. It clings. The shining spleenwort is a rock fern. It grows on vertical surfaces. These include cliff faces, rock walls, and the sides of boulders. Its roots creep into the cracks and crevices. It holds on where there is no soil. It collects moisture from the air. It collects moisture from the spray of the sea. It tolerates salt, wind, and sun. Most forest ferns cannot manage this. This one does. Reproduction occurs by spores, like all ferns. The sporangia are clustered on the undersides of the fronds. They are protected by a thin membrane. When the spores are ripe, the membrane lifts. The spores are released into the wind. It grows in clumps. It often shares space with other rock ferns and mosses. Its glossy fronds stand out against the grey rock. It is a flash of green on the cliff face. In a world of feathery, lacy, delicate ferns, those that hide in the deep shade and never see the sun, the shining spleenwort is the bold one. It grows where the light hits. It shows its face. It polishes its leaves and waits to be noticed. And it is noticed. Walk along any coastal track in New Zealand. Look up at the rock faces. You will see it. A patch of glossy green on the grey stone. The fern that came to the coast. It looked at the wind and the salt and the spray. It said it can work with this. No one told it otherwise.