scripts tiny lines on smooth tree bark
- Size
- Width: 2–10 cm
- Lifespan
- 10–50 years
- Diet
- Symbiotic partnership. Fungus provides structure. Alga provides food via photosynthesis. Requires clean air and high humidity.
- Habitat
- Grows on smooth bark of trees throughout New Zealand. Particularly on native trees in damp, undisturbed forests. Found from sea level to montane zone in humid, sheltered locations.
- Range
- Found throughout North and South Islands on smooth bark of beech and podocarp trees. Most common in South Island beech forests and North Island western ranges. Also found worldwide.
- Endemism
- Native
- Main Threats
- None significant. Common and widespread in damp, undisturbed forests. Localised threats include forest clearance, air pollution, and removal of old trees.
- Population
- Not Threatened. Common and widespread lichen in New Zealand. Particularly on smooth bark of beech and podocarp trees in native forests.
- Conservation Status
- Not Threatened
- Human Risk
- harmless
- Handling Note
- crustose lichen, safe to handle
- Conservation Note
- Native lichen; not assessed by NZTCS as lichens are generally outside the scope of current threat classifications.
- Te Ao Māori
- No recorded Māori name distinguishes graphis script lichen from other lichens. Lichens were generally called pūkohu or pukorokoro. The fine, black lines would have been noticed. Looked like writing. Like marks of a tool. Like a message from the forest. No distinct name survives. Sometimes used as a dye. Pale pigment extracted to colour fibres. Though not as vibrant as other lichens.
It is not random. Graphis scripta looks like tiny writing. Its body is a thin, crusty layer growing on the surface of the bark. Forming a pale greyish-white patch. But the most distinctive feature is the fine, black, branching lines covering the surface. These lines look exactly like handwriting. Like someone tried to write a message on the tree with a very fine pen. Then gave up halfway through. It is the lichen of the unfinished letter. The one that looks like a secret message waiting to be read.
What makes it special is the lines. Graphis script lichen is one of the most distinctive lichens in New Zealand. Its surface is covered in fine, black, branching lines called lirellae. The lirellae are the spore-producing structures. They look exactly like written script. The lines are thin and delicate. Often forked or curved. Forming patterns that look like letters, words, or maps. It is the lichen of the hidden message. The one that looks like it has something to say. The one that makes you lean in closer to try to read it.
It is a crustose lichen. Meaning it grows flat on the bark. Like a crust of paint. Rather than upright or leafy. Its body is a smooth or slightly cracked crust. Pale greyish-white. Often with a greenish tint. The lirellae are embedded in the crust. Sometimes raised slightly above the surface. Under a hand lens, they look like tiny black trenches. Their walls lined with spore-producing tissue.
Biologically, it is a partnership. A fungus and an alga living together. The fungus provides structure and protection. The alga provides food through photosynthesis. The lirellae are the fruiting bodies. Producing spores that will grow into new lichens.
To find graphis script lichen is to find the tiny writing on the bark. It is pale, crusty, and scripted. A living message on the tree. You can run your finger over the surface. Feel the fine, black lines. It is the lichen of the unfinished letter. The one that looks like someone tried to write on the bark and gave up. The one that proves the forest has its own language. If you know how to read it. No one told it otherwise.