feldman9 - layers of cortex beneath epidermis The second...

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Dr. Feldman’s Lecture Outlines - 13 Lecture 9, Shoots, secondary structure -Secondary growth responsible for increase in width -Results from the vascular cambium which is a lateral meristem. -produces seconday xylem = wood -produces secondary phloem = bark -Origin of the vascular cambium -how does it function? -fusiform initials = axial (up and down) system -ray initials = radial system -Rays -characteristics -Annual rings -Monocots lack a vascular cambium -how do they then increase in width? -The cork cambium -is another type of lateral meristem -produces cork -periderm = cork and associated layers -cork may arise in 2 ways. The first (and sometimes only cork cambium) arises in outer
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Unformatted text preview: layers of cortex beneath epidermis. The second cork cambium arises in outer regions of the secondary phloem. This can happen many times and leads to an alternation between layers of secondary cork and secondary phloem. But only the tissue to the inside of the most recently formed cork is alive.-Consideration of how a tree grows in width-Consideration of the different cell types, and their arrangements as a tree ages.-What are knots and knot holes?-Further consideration of annual rings-Bark-Lenticels-Practical and economic aspects of wood...
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