lejeunea liverwort the tiniest of the leafy liverworts
- Size
- Width: 1–2 cm
- Lifespan
- 1–3 years
- Diet
- Grows on leaves of other plants, bark, and damp rocks in humid forests. Requires high humidity, stable surfaces, and protection from direct sunlight. An epiphyll, a plant that lives on leaves of other plants.
- Habitat
- Grows on the leaves of other plants, on bark, and on damp rocks in humid forests throughout New Zealand. Minute, smaller than a fingernail, creeping across the surface of leaves like a quiet conspiracy, a green whisper on the green leaf. The liverwort of the hidden conspiracy, the one that lives on the leaves of others.
- Range
- Found throughout the North and South Islands on leaves of other plants, bark, and damp rocks in humid forests. Most common in lowland and montane forests with high rainfall. Also found in tropical and temperate regions worldwide.
- Endemism
- Native
- Main Threats
- None significant. This species is common but under-recorded due to tiny size. Localised threats include forest clearance, removal of host plants with stable leaf surfaces, and climate change reducing forest floor humidity.
- Population
- Not Threatened. Lejeunea liverwort is common on the leaves of other plants, on bark, and on damp rocks in humid forests throughout New Zealand. It is a widespread species found in tropical and temperate regions around the world.
- Conservation Status
- Not Threatened
The one that lives on leaves has stems that are creeping and branching, forming flat, minute mats on the surface of leaves, on bark, and on damp rocks. The leaves are tiny, less than half a millimetre long, and they overlap like the scales of a fish. The colour is pale green to yellowish-green, often with a translucent quality. The whole plant is so small that you could fit a dozen of them on your fingernail. It creeps across the leaf surface like a quiet conspiracy, a green whisper on the green leaf. It is the liverwort of the hidden life, the one that lives in the shadows of the leaves.
What makes it special is the tininess. Lejeunea liverwort is one of the smallest liverworts in New Zealand. Its leaves are less than half a millimetre long, and its stems are thinner than a thread. It is an epiphyll, a plant that grows on the surface of leaves, and it lives its entire life on the leaf of another plant. It is the liverwort of the miniature world, the one that lives in the cracks between the leaf veins, the one that is easy to miss but impossible to ignore once you see it.
The leaves are tiny and overlapping, with a distinct, rounded tip. The leaves are arranged in two rows along the stem, and each leaf has a small, inflated lobe (water sac) that helps the plant retain moisture. Under a hand lens, the leaves are beautiful, a perfect mosaic of green and pale green.
Biologically, the lejeunea liverwort reproduces by spores, released from capsules on short stalks. It also reproduces asexually via gemmae. The gemmae break off and grow into new plants, a form of cloning that allows the liverwort to spread across the leaf surface.
To find lejeunea liverwort is to look closely at the leaves of other plants. There it is, a tiny, pale green, creeping mat, smaller than a fingernail, a quiet conspiracy on the leaf surface. It is the liverwort of the hidden life, the one that lives in the shadows of the leaves, the one that proves that the most interesting things are often the smallest and the most easily overlooked.