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Discovery 14 / 27

Puschel & Flauschi’s Forest Discoveries

The Leaf with Little Roads

On a fallen leaf, Puschel finds a branching road map. Flauschi explains what travels along those fine lines.

The green explorer’s magnifying glass with a leaf-shaped handle

Puschel studies the branching lines of a fallen leaf through the green magnifying glass. Flauschi points towards a line without touching the leaf.
The branching lines are called leaf veins. Tiny tubes inside them supply a living leaf.

A green leaf lay on the woodland path after the wind had shaken it from a tree. Puschel knelt beside it and admired the line down its middle. Lots of smaller lines branched off it.

Puschel“A road map! Only the stop for the Nut Bus is missing.”

Flauschi sat beside him. Puschel held the green magnifying glass a little way above the leaf. The lines looked bigger, but there was no bus anywhere.

Flauschi“These lines are called leaf veins. Tiny tubes run inside them. They are a little like routes for water and other things. Of course, no vehicles travel along them.”

Flauschi explained that a tree’s roots take in water from the soil. The water contains tiny things that help the tree grow. These are called minerals. Water reaches the leaf through tubes in the trunk and leaf veins.

Puschel“Then the tree has its water routes built in. Without a garden hose!”
Flauschi“Sugar is sent out from a living green leaf too. The plant makes it using sunlight, water and a part of the air called carbon dioxide. Other parts of the plant can use that sugar.”

Puschel waited for a water drop to rush past. Flauschi smiled and shook her head. They could not see movement inside the tiny tubes this way. And this leaf was already separated from its tree.

Puschel“So I can see the routes, but I cannot watch the bus traffic.”

Flauschi nodded. The veins also helped support a leaf. Together they looked at the little branches in the pattern. Then they left the leaf where it lay. Puschel loved his road map even without a bus stop.

Look closely

What the two discovered

  • The lines in a leaf are called leaf veins. Tiny tubes run inside them. Many leaves have a branching network. Others have veins that run more side by side.

  • Tubes in a living leaf carry water and minerals dissolved in it. Minerals are things from the soil that help plants grow. Water reaches the leaf through the roots and trunk.

  • Other tubes take sugar from a leaf to other parts of the plant. The plant makes its own sugar using light, water and carbon dioxide from the air. Carbon dioxide is an invisible part of air. Making sugar with light is called photosynthesis.

  • Leaf veins also help support a leaf. We can study their lines on a fallen leaf. An ordinary magnifying glass cannot show us water or sugar flowing inside the tiny tubes.

Explorer’s rule: Leave animals and plants in peace. Just watch and do not damage anything.

Sources for adults: RHS: How plants absorb water · RHS: Water transport in leaf veins · Sack et al.: Leaf veins and support (PNAS)

Keep exploring

Where shall we wusel next?

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Look for woodland treasures

Take an adult along and choose the printable nature bingo. Leave plants and animal homes untouched.

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