horns out on the damp stream bank soil
- Size
- Width: 2–5 cm
- Lifespan
- 1–3 years
- Diet
- Photosynthetic. Draws energy from sunlight. Requires consistent moisture, high humidity, and protection from direct sunlight.
- Habitat
- Grows on damp soil, stream banks, and rotting logs in humid, shaded forests. Forms flat, dark green thalli with dramatic blackish-green horns rising above.
- Range
- Found throughout North and South Islands on damp soil, stream banks, and rotting logs. Most common in lowland and montane forests with high rainfall. Also found worldwide.
- Endemism
- Native
- Main Threats
- None significant. Common and widespread in humid, shaded forests. Localised threats include forest clearance, drainage of wetlands, and climate change reducing moisture.
- Population
- Not Threatened. Common on damp soil, stream banks, and rotting logs in humid, shaded forests throughout New Zealand. Widespread in tropical and temperate regions.
- Conservation Status
- Not Threatened
- Human Risk
- harmless
- Handling Note
- common hornwort, safe to handle
- Conservation Note
- Native hornwort; not assessed by NZTCS as bryophytes are generally outside the scope of current threat classifications.
- Te Ao Māori
- No recorded Māori name distinguishes megaceros hornwort from other hornworts. Hornworts generally called pūkohu or grouped with small damp-loving plants. Flat, dark green mats with dramatic, whip-like horns noticed. Looked like antennae of insect. Like horns of creature. No distinct name survives. Not used as medicine or dye. Too small. Too hidden. Too easy to overlook except when in full horn. Then unmistakable.
It is not subtle. Megaceros flagellaris looks like flat green pancake with alien antennae. Body or thallus is flat, lobed, and rosette-forming. Growing in dark green to olive-green sheets on damp soil. Thallus is smooth and shiny. Often with bluish-green tint. Lies low on ground. Quiet, unassuming presence. But sporophytes, horn-like spore-producing structures, are something else entirely. Long, slender, and dramatic. Reaching 3 to 6 centimetres in height. Dark green to blackish-green. Twisted, flagelliform or whip-like shape giving species its name. Rise from thallus like alien antennae. Like dramatic gestures from otherwise low-key life. Hornwort of big reveal. Saves energy for show.
What makes it special is drama. Megaceros hornwort has most dramatic sporophytes of any hornwort in New Zealand. Horns are long, twisted, and whip-like. Striking contrast to flat, low-key thallus. Plant's way of saying look at me after lifetime of blending in. Hornwort of dramatic gesture. Goes big when it finally gets moment. Proves patience pays off.
Thallus is flat and lobed. Growing in rosettes that can be 3 to 8 centimetres across. Only few cells thick in most places. Making it translucent and delicate. Surface covered in tiny pores or stomata allowing gas exchange. Under hand lens, pores visible. Tiny openings scattered across green surface.
Biologically it reproduces by spores released from horn-like sporophytes. Sporophytes grow continuously from base. Unique feature among land plants. Can persist for months. Spores tiny. Carried by wind to new locations.
To find megaceros hornwort is to find flat, dark green thallus on damp soil. Then look up to see dramatic horns rising above. Long, twisted, and whip-like. Quiet life punctuated by dramatic gesture. Hornwort of big reveal. Saves energy for show. Proves most dramatic moments are worth wait. No one told it otherwise.