Leaf Trace

Also found in: Dictionary, Medical.

leaf trace

[′lēf ‚trās]
A section of the vascular bundle that leads from the stele to the base of the leaf.
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 It might be outdated or ideologically biased.

Leaf Trace


a vascular bundle in the stem of a plant that directly connects the stem with a leaf. Depending on the plant species, one or several leaf traces may be associated with each leaf. From the base of the leaf down through the stem, the leaf trace passes through several internodes that correspond to the particular leaf arrangement and encounters and merges with other leaf traces that lead to previously developed leaves. Thus, a unified network of conducting bundles is formed in the shoot. Some vascular plants, such as lycopods, have small simple leaves (microphylls) with weak leaf traces that do not reach the conducting cylinder of the stem. The macrophyllous leaves of the Polypodiaceae, Gymnospermae, and Angiospermae have large leaf traces and are characterized by numerous leaf gaps.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Blechnum cordatum has multiple leaf trace stipes, with 14-16 vascular strands in adult stages, but plantlets iniciate with 3 vascular strands only, and the number of strands increases with age (Prada et al.
The primary vasculature is non-sympodial, and primary xylem only occurs as the downward extension of mesarch leaf traces (Fig.
The parenchymatous cortex has idioblasts, abundant mucilage ducts, and oblique, semigirdling leaf traces [ILLUSTRATION FOR FIGURE 5C OMITTED].