Elder Stem
by Science Photo Library
Title
Elder Stem
Artist
Science Photo Library
Medium
Photograph - Photograph
Description
Elder stem. Light micrograph of a cross-section through the periderm of an elder (Sambucus niger) stem. The periderm is composed of three types of cells. The layer of cells third from bottom are the phellogen (cork cambium). This is a layer of actively dividing cells (meristemetic) which produce regular tiers of cells (pink). These cells become impregnated with suberin and die, forming a layer of cork cells (phellem, red). Cork is an impermeable layer that protects the plant.
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October 8th, 2019
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