metzgeria liverwort with pale forking ribbons on damp bark
- Size
- Width: 2–5 cm
- Lifespan
- 3–7 years
- Diet
- Grows on bark of trees, rocks, and wood in damp, shaded forests. Requires consistent moisture, high humidity, and stable bark surfaces. Forms flat, ribbon-like strands that split and split again, forking into a network of green branches that never quite decide where they are going.
- Habitat
- Grows on bark of trees, rocks, and wood in damp, shaded forests. Forms flat, ribbon-like strands that fork into a network of green branches.
- Range
- Found throughout the North and South Islands on bark of native trees, rocks, and wood in damp, shaded forests. Most common in lowland and montane forests with high rainfall. Also found in temperate regions worldwide.
- Endemism
- Native
- Main Threats
- None significant. This species is common and widespread in damp, shaded forests. Localised threats include forest clearance, removal of old trees with stable bark surfaces, and climate change reducing forest floor humidity.
- Population
- Not Threatened. Metzgeria liverwort is common on the bark of native trees, on rocks, and on wood in damp, shaded forests throughout New Zealand. It is a widespread species found in temperate regions around the world.
- Conservation Status
- Not Threatened
The one that looks like a tangle of green ribbons has a body (thallus) that is flat, ribbon-like, and branching, forming loose, sprawling mats on the bark. The ribbons are translucent and pale green, often with a waxy sheen. They split and split again, forking into a network of branches that never quite go in a straight line. It is the liverwort of the indecisive split, the one that keeps changing its mind about where it is going, the one that looks like it cannot commit to a direction.
What makes it special is the branching. Metzgeria liverwort is one of the most branched liverworts in New Zealand. Its thallus forks repeatedly, creating a complex network of green ribbons that spread across the bark. The branches are flat and ribbon-like, with a distinct midrib that runs down the centre. The margins are wavy and often have a fringe of tiny hairs. It is the liverwort of the endless fork, the one that never quite decides, the one that seems to embody the idea of possibility.
The thallus is only one cell thick in most places, making it translucent and delicate. The surface is covered in tiny, peg-like projections (papillae) that give it a slightly rough texture. The colour is a pale, translucent green, often with a waxy sheen. Under a hand lens, the papillae are visible, tiny bumps that catch the light.
Biologically, the metzgeria liverwort reproduces by spores, released from capsules on short stalks. It also reproduces asexually via gemmae, small, disc-like propagules that form on the thallus. The gemmae break off and grow into new plants, a form of cloning that allows the liverwort to spread across the bark.
To find metzgeria liverwort is to find the tangle of green ribbons on the bark. They are pale, translucent, and forked, a living indecision on the trunk. You can see the way they split and split again, the way they never quite decide where to go. It is the liverwort of the endless fork, the one that keeps changing its mind, the one that proves that not knowing where you are going can be a beautiful thing.