Also found in: Medical.
concentric bundle[kən′sen·trik ′bən·dəl]
A vascular bundle in which xylem surrounds phloem, or phloem surrounds xylem.
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 It might be outdated or ideologically biased.
a bundle of conducting tissues of xylem and phloem in the stems and leaves of several ferns and angiosperms. In an amphicribral bundle, the phloem surrounds the xylem. In an amphibasal bundle, the xylem surrounds the phloem.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.