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Unformatted text preview: stem The wood oF hardwood trees is classi³ed as either ring-porous oF di´use-porous depending on how the vessels are arranged in the growth rings. In a ring-porous hardwood the vessels Formed in the earlywood are larger than those Formed in the latewood In a di´use-porous hardwood, the vessel diameters are essen±ally the same throughout all the growth rings The longitudinal cells in the hardwood tree stem are ³bers These are elongated cells with close pointed ends and are usually thick walled Length of this Fbers are about .7 to 3 mm and average diameter is 20 micrometer The food storage cells of hardwood are the ray (transverse) and longitudinal parenchyma which are brick or box shaped The rays of hardwoods are usually much larger than for so±wood, having many cells across their width. b. i. length of the Fbers ii. large diameter vessels iii. direc²on of the wood rays...
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- Fall '07
- large diameter vessels, larger size cells