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Fig.
7.3-5b.
Longitudinal section of vascular bundle in corn (Zea mays). As in Fig.
7.3-5a, this vessel has a simple perforation plate facing us. Although it looks
as if the perforation is on a side wall, we are looking at a tilted end wall;
the region above the perforation is one vessel element, the region below it is
different vessel element.
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