leaf trace

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leaf trace

a VASCULAR BUNDLE that extends between the main stem and the leaf base.
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The parenchymatous cortex has idioblasts, abundant mucilage ducts, and oblique, semigirdling leaf traces [ILLUSTRATION FOR FIGURE 5C OMITTED].
Examples of such structural synapomorphies for the extant Cycadales are girdling leaf traces, an inverted omega pattern of vascular bundle arrangement in petiole and cataphyll bases, protoxylem poles changing from endarch in the stem to exarch in the leaf traces, a primary thickening meristem, a contractile taproot, and ageotropic, coralloid, lateral roots (Stevenson, 1990b; Norstog & Nicholls, 1998).
The most conspicuous and easily observable of these characters in fossils are the presence of girdling leaf traces, medullary bundles, polyxyly, cortical steles, and inverted, peripheral, pith bundles.