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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Stipes short, 20-25 (39) cm, stiff in adult plants, adaxially canaliculated, moderate to densely scaly, scales similar to those of rhizome; adult stipes nearly circular in section, with one deep groove, papillate epidermis, hypodermic zone of fibers 8-10 layers thick, leaf trace with 3 vascular strands.
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.
It is a septate cordaitalean axis with mesarch leaf traces and a non-sympodial vasculature.
Leaf traces are collateral with scalariform tracheids.