File:Woody Dicot Stem Lenticel Formation in Liriodendron (36584602711).jpg

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cross section: Sambucus stem magnification: 400x

During the first year of growth the underling activity of the cork cambium begins to replace the cutinized epidermis and outer cortical tissues with a protective layer of cork rich periderm. The outermost layer of periderm consists of layers of cork cells, the phellem, which produce the waterproofing substance suberin. Cork cells are dead at maturity. 

Deep to the phellem is a layer of living cork cambium or phellogen and just beneath that layers of cork parenchyma or phelloderm. Many cells in the periderm contain dark staining tannins.
Deep to the periderm is a narrow cortex of parenchyma cells.
Date
Source Woody Dicot Stem: Lenticel Formation in Liriodendron
Author Berkshire Community College Bioscience Image Library

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Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
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This image was originally posted to Flickr by bccoer at https://flickr.com/photos/146824358@N03/36584602711 (archive). It was reviewed on 23 June 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero.

23 June 2018

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