leaf gap


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leaf gap

the region of the vascular cylinder above the LEAF TRACE where PARENCHYMA occurs. Leaf gaps are characteristic of ferns, gymnosperms and flowering plants.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Stele with leaf gaps in xylem: 0 = absent; 1 = present.
Stele with leaf gaps in phloem: 0 = absent; 1 = present.
FOSSILS AND FERN PHYLOGENY
The polycyclic steles are divided into many wedges by the presence of large leaf gaps. The secondary xylem has scalariform or pitted (biseriate-triseriate) tracheids.
Fossil Cycadales of Argentina
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