Mosses and Ferns: The Ancient Plants Without Flowers

Plants from long, long ago

Most of the plants you know best have flowers and grow from seeds — apple trees, sunflowers, grasses, roses. But two very ancient groups of plants do neither. They have no flowers and no seeds at all. They are the mosses and the ferns, and they were thriving on Earth hundreds of millions of years ago — long before the first flower ever bloomed, and even before the dinosaurs.

To understand them, we have to think about plants in a slightly different way.

Reproducing with spores, not seeds

A flowering plant makes seeds, and you can read how in The Life Cycle of Plants. Mosses and ferns work differently. They reproduce using spores — tiny specks, far smaller than seeds, often too small to see clearly without a magnifier.

A single fern can release millions of spores into the air. Most land somewhere unsuitable and die, but a few land in a damp spot and grow.

There is one important catch: mosses and ferns need water to reproduce. Their tiny sperm cells have to swim through a film of water to reach an egg. That is a big reason these plants love damp, shady places — without moisture, they cannot make the next generation.

Mosses: small, simple and tough

Mosses are the little green cushions you find on damp walls, rocks, logs and forest floors. Up close, each plant is a tiny stem covered in even tinier leaf-like flaps.

What makes mosses special — and limits them — is what they don't have:

• They have no true roots. Instead they grip surfaces with thread-like anchors.
• They have no veins or tubes inside to carry water from one part to another. (We say they are non-vascular.)

Because they cannot pipe water around their bodies, mosses must soak up moisture directly from the air and rain, all over their surface. This is why they only grow a few centimetres tall and stick to damp, shady spots. In a dry spell, many mosses dry out completely and look dead — yet add water and they spring back to life.

Mosses may be small, but they are mighty: they soak up rainwater like sponges, help prevent soil washing away, and create a soft home for tiny creatures.

Ferns: big leafy plants with hidden machinery

Ferns are much larger and leafier. Their big, feathery leaves are called fronds, which often uncurl from a tight coil shaped like the top of a violin — sometimes called a "fiddlehead".

Unlike mosses, ferns do have internal plumbing. They have true roots, stems and leaves with veins, all built from special water-carrying tubes (this makes them vascular plants). These tubes let a fern pump water and food up and down its body, so it can grow far taller than any moss — some tropical tree ferns reach the height of real trees.

If you turn over a fern frond in summer, you may see rows of tiny brown or orange dots on the underside. These are sori — clusters of spore capsules. When ripe, they burst and scatter spores to the wind.

Why these plants matter

Mosses and ferns are not just leftovers from the past. They still matter today:

• Living history. Giant fern forests hundreds of millions of years ago were buried and slowly turned into coal — the fuel we still dig up today.
• Water and soil. Mosses store water and protect soil, helping whole habitats stay healthy.
• Pioneers. Mosses are often the first plants to grow on bare rock or burnt ground, slowly creating soil for bigger plants to follow.

They are a beautiful reminder that not every plant needs a flower to succeed.

Try it yourself: a fern spore print

You can collect spores from a fern, just like collecting a fingerprint.

1. In late summer, find a fern frond with ripe brown dots (sori) on the underside.
2. Lay the frond, dots facing down, on a sheet of white paper. Cover it gently with a bowl so no draught disturbs it.
3. Leave it overnight. The next day, carefully lift the frond away.
4. You should see a fine dusty pattern on the paper — millions of spores, exactly tracing where the sori were.

While you are out, look for mosses too. Press one gently: notice how it springs back, and how it loves the shadiest, dampest corner of the garden. You are looking at one of the oldest kinds of life on land.