opegrapha script lichen with elongated marks on smooth bark
- Size
- Width: 2–10 cm
- Lifespan
- 10–50 years
- Diet
- Grows on smooth bark of trees in damp, undisturbed forests. Requires clean air, stable bark surfaces, and high humidity. Tolerates shade and moisture but cannot survive prolonged drought.
- Habitat
- Grows on smooth bark of trees in damp, undisturbed forests. Found in humid, sheltered locations where the bark is smooth and the air is clean.
- Range
- Found throughout the North and South Islands on smooth bark of beech and podocarp trees in damp, undisturbed forests. Most common in the South Island's beech forests and the North Island's western ranges. Also found in temperate regions worldwide.
- Endemism
- Native
- Main Threats
- None significant. This species is common and widespread in damp, undisturbed forests. Localised threats include forest clearance, air pollution, and removal of old trees with smooth bark.
- Population
- Not Threatened. Opegrapha script lichen is common and widespread in New Zealand, particularly on the smooth bark of beech and podocarp trees in native forests. It grows on native and introduced trees.
- Conservation Status
- Not Threatened
The one that looks like someone took a pen to the bark has a body that is a thin, crusty layer that grows on the surface of the bark, forming a pale greyish-white patch. But the most distinctive feature is the fine, black, branching lines that cover the surface. These lines look exactly like scribbled handwriting, like someone tried to write a message on the tree with a very fine pen and kept going. It is the lichen of the scribbled mark, the one that looks almost intentional.
What makes it special is the scribbles. Opegrapha script lichen is one of the most writing-like lichens in New Zealand. Its surface is covered in fine, black, branching lines called lirellae. The lirellae are the spore-producing structures of the lichen, and they look exactly like scribbled handwriting. The lines are thin and delicate, often curved or forked, forming patterns that look like letters, words, or abstract drawings. It is the lichen of the intentional mark, the one that looks like the forest is trying to tell you something, the one that makes you lean in to try to read it.
The opegrapha script lichen 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, the lirellae look like tiny black trenches, their walls lined with the spore-producing tissue.
Biologically, the opegrapha script lichen 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 opegrapha script lichen is to find the scribbled marks on the bark. It is pale, crusty, and scribbled, a living message on the tree. You can run your finger over the surface and feel the fine, black lines. It is the lichen of the scribbled mark, the one that looks almost intentional, the one that proves that the forest has its own language, if you know how to read it.