Fern Stem
by Dr Keith Wheeler/science Photo Library
Title
Fern Stem
Artist
Dr Keith Wheeler/science Photo Library
Medium
Photograph - Photograph
Description
Fern stem, light micrograph. Transverse section through a rachis (stem) of the bracken fern (Pteridium aquilinum). Under the outer epidermis (orange) is a thin cortex (yellow and red) of thick-walled cells (sclerenchyma). The rest of the stem consists of a supporting tissue of parenchyma cells (red walls). Within the stem, embedded in the parenchyma, are vascular strands (oval-shaped) called the meristeles. At the centre of these are thick-walled wood cells (xylem). Magnification: x14 when printed at 10 centimetres wide.
Uploaded
September 24th, 2019
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