Periderms - definition of periderms by The Free Dictionary
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The outer layers of tissue of woody roots and stems, consisting of the cork cambium and the tissues produced by it, such as cork.
per′i·der′mal, per′i·der′mic adj.
(Botany) the outer corky protective layer of woody stems and roots, consisting of cork cambium, phelloderm and cork
[C19: from New Latin peridermis]
ˌperiˈdermal, ˌperiˈdermic adj
per•i•derm (ˈpɛr ɪˌdɜrm)
the cork-producing tissue of plant stems together with the cork layers and other tissues derived from it.
[1830–40; < New Latin peridermis.
per`i•der′mal, per`i•der′mic, adj.
The outer, protective layers of tissue of woody roots and stems, consisting of the cork cambium and the tissues produced by it. See more at cork cambium
References in periodicals archive
In the anatomical/botanical sense the rhytidome (successive periderms
interspersed with the non-conducting phloem) does not exist in the woody monocots, but the successive layers of the cork are separated by suberized undivided cortical cells (Philipp, 1923).
In many barks, new periderms
form to the inside of the first formed periderm
, entrapping phloem between the layers and resulting in an overlapping series of scales of plates.
Another significant bark fraction was comprised of cellular debris from the obliterated phloem tissues in bark that are partitioned by the periderms
As this happens, new periderms
are initiated within secondary cortex.
However, in some taxa successive periderms
may develop in the outer cortex, and the hypodermis eventually disappears.
Rhytidome is formed by four layers of suberized secondary phloem and its periderm