SIMON BOOTH / SCIENCE PHOTO LIBRARY SIMON BOOTH / SCIENCE PHOTO LIBRARY
Polytrichum commune moss. This moss is common in wet moorland and by woodland streams, where it grows in luscious green clumps before shedding spores. Damp conditions are necessary because mosses have no true roots, depending instead on their leaves to absorb water and minerals. Water is also needed for reproduction. Photographed in the UK.
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