It is not rare. Not yet. But the single crape fern faces increasing pressure from habitat degradation throughout New Zealand forests. This large fern reaches up to one metre in height, with broad fronds that spread like a crape. The fronds are divided into many small leaflets that create a dense canopy over the forest floor. Heruheru. The Māori name refers to this common wetland fern. Early Māori likely encountered single crape fern in boggy areas though its small size meant it was probably less significant than larger edible ferns. Settlers found the fern less palatable but recognised its value as ground cover in shady gardens. Today the species serves as an indicator of forest health. Its presence signals intact riparian zones and suitable moisture levels. The species inhabits damp shaded gullies and stream banks in native forests throughout New Zealand. It prefers moist fertile soils with high humidity, thriving where rainfall is consistent and drainage is good. Fronds are broad and spreading, coloured bright green. Spores are produced on the underside of fertile fronds in small round clusters called sori. These spores are released into the air, drifting on wind currents until they land on suitable substrate. Diet consists of nutrients obtained through photosynthesis and absorption from soil via shallow root systems. The fern does not consume organic matter directly but rather extracts minerals and water from surrounding substrate. This autotrophic lifestyle allows it to thrive in nutrient-poor soils where other plants struggle. Classified as Not Threatened, single crape fern remains widespread throughout New Zealand. Populations are stable in suitable forest habitat. However the species is sensitive to habitat disturbance. When forests are logged or modified, populations decline rapidly. Its presence signals intact mycorrhizal networks and healthy forest ecosystems. Conservation efforts focus on protecting remaining native forests from logging and development to maintain these critical underground connections.