DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Clubmoss stem, polarised light micrograph. Transverse section through the stem of the clubmoss Lycopodium clavatum. This is the central portion of the stem consisting of the inner cortex (red, right) and the central vascular cylinder (stele, round, centre left). The inner cortex consists of thick-walled sclerenchyma cells. The stele consists of thick-walled wood (xylem) cells and thin-walled parenchyma cells interspersed with phloem (both blue). The rim of the stele has two layers: the pericycle (blue) and the endodermis (green). Magnification: x100 when printed at 10 centimetres wide.
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