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Development of the Tree Trunk from the Young Tree Stem
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bands black locust bordered pits cambium cell walls characteristic odor Characteristics and Properties.—Sapwood coniferous coniferous woods conifers darker Desc endwise compression fiber tracheids fleck forming frequently fusiform grain growth increments Growth rings hand lens hardwoods heartwood intervessel pits layer lignin longitudinal parenchyma longitudinal tracheids metatracheal metatracheal-diffuse Michx microns in diameter moderately naked eye paratracheal periderm phloem pine Pinus pit pairs pits leading porous woods portion present protoplast radial walls ray cells ray crossing ray parenchyma ray tracheids red gum rows sapwood secondary wall seriate shock resistance species spiral thickening spring to summer spring-wood Spring-wood pores spring-wood vessels stem strand summer wood tangential plane tangential surface Taxodium distichum Text Fig thick-walled timbers tissue transition from spring transverse section transverse surface tree tyloses U.S. Department U.S. Dept upright cells usually vascular veneer vessel segments visible western hemlock western larch white pine width wood rays xylary yellow zone