50.3 MB (50.0 MB compressed)
5138 x 3425 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Moss stems, light micrograph. Transverse section through stems of a cord moss (Polytrichum commune). The outside of the stems, the epidermis, is made up of thick-walled cells. Below the epidermis is a cortex made up of thin-walled cells. In the center of the stem is the axial cylinder. This consists of a core (hadrome) made up of large thickened cells thought to conduct water, and a thin outer layer (leptome) of thin-walled cells thought to conduct food. Magnification: x14 when printed at 10 centimetres wide.
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