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Layers of parenchymatous cells formed as inward derivatives of the phellogen.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the internal layer of the periderm in plants, which originates as a result of the division of phellogen cells in a direction parallel to the surface of the organ. Phelloderm cells resemble phellogen cells in shape, and their membrane and contents are similar to those of parenchyma cells of the primary cortex or of fibrous parenchyma. Unlike phellogen and parenchyma cells, however, phelloderm cells are always arranged in radial rows. In roots with secondary thickening, such as pine, the phelloderm often proliferates and is transformed into storage tissue.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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